Early Ascent to International Stardom

Regan Smith first burst onto the global scene at the 2019 World Aquatics Championships in Gwangju, where the 17-year-old American shattered the world record in the 200-meter backstroke with a time of 2:03.35. That swim not only announced her arrival but also set the stage for a series of fierce rivalries that would define the next generation of elite backstroke and medley racing. Her combination of technical efficiency, underwater dolphin kicks, and closing speed made her an immediate threat to established stars. Even before that breakout, Smith had shown promise by winning the 200-meter backstroke at the 2018 U.S. National Championships at age 16, signaling that she was ready to challenge the best.

Smith’s rapid rise was no accident. Growing up in Lakeville, Minnesota, she trained with the Riptide Swim Club before moving to Arizona to work with coach Bob Bowman, the legendary mentor of Michael Phelps. Under Bowman’s guidance, Smith refined her race strategy and developed the stamina needed to compete across multiple events, including the 100-meter backstroke, 200-meter butterfly, and individual medleys. Bowman emphasized a scientific approach to her stroke rate, breathing patterns, and underwaters—areas that would become critical in head-to-head battles. By the time the Tokyo Olympics arrived in 2021, Smith was a medal favorite, but her path to glory ran directly through a trio of formidable rivals. The pressure of those early expectations shaped the competitor she would become.

The Defining Rivalry: Kaylee McKeown

No rivalry has been more impactful on Smith’s career than her head-to-head battles with Australian backstroker Kaylee McKeown. The two swimmers have traded world records, Olympic medals, and world titles across both the 100-meter and 200-meter backstroke events, creating one of the most compelling narratives in recent swimming history. Their races are more than contests of speed—they are tactical duels that highlight contrasting strengths: McKeown’s explosive start and turn speed versus Smith’s endurance and closing ability.

World Records and Olympic Gold

McKeown first made her mark at the 2021 Australian Olympic Trials, where she broke Smith’s 100-meter backstroke world record with a time of 57.45 seconds. Just weeks later at the Tokyo Olympics, McKeown edged Smith in the 100-meter back final, 57.47 to 58.05, to claim gold. Smith took bronze behind Canada’s Kylie Masse. In the 200-meter back, McKeown again prevailed, winning in 2:04.68 to Smith’s 2:05.39, earning silver. The margins were narrow—less than a second in both races—but the outcome signaled a shifting of the guard. Smith later admitted that those losses burned deeply and became the fuel for her subsequent training cycles.

The rivalry intensified at the 2022 World Aquatics Championships in Budapest. Smith rebounded by winning the 100-meter backstroke in 58.54, beating McKeown (59.05) for the first time at a major international final. That victory was a statement of resilience, demonstrating that Smith could overcome the Olympic disappointment. McKeown struck back in the 200-meter back, taking gold in 2:05.08, with Smith earning bronze. The two also met in the 4×100-meter medley relays, where each led her respective team to silver and gold finishes. The pair competed again at the 2022 Commonwealth Games, where McKeown swept both backstroke events on home soil in Birmingham, but Smith did not attend that meet, instead focusing on the U.S. Nationals and Pan Pacific Championships.

In 2023, the rivalry reached new heights. At the U.S. National Championships, Smith lowered her own American record in the 200-meter backstroke to 2:03.87, the second-fastest time ever. But McKeown responded at the World Aquatics Championships in Fukuoka, winning the 100 back (57.53) and 200 back (2:03.85), edging Smith in both. Their times in Fukuoka’s 200 back final – McKeown 2:03.85, Smith 2:04.94 – showed margins measured in tenths of a second, underscoring the razor-thin difference between the two. The 2024 World Championships in Doha saw Smith reclaim the 100-meter backstroke crown with a time of 57.13 seconds, just off McKeown’s world record of 57.03, while McKeown skipped that meet. This pattern of alternating dominance has kept the rivalry in the headlines.

Statistical Breakdown

The Smith-McKeown rivalry is statistically one of the closest in swimming history. As of early 2025, the two have combined for three of the five fastest 100-meter backstroke swims of all time and all four fastest 200-meter backstroke swims. In direct head-to-head clashes at Olympic or World Championship finals (including semifinals), McKeown holds a narrow 5–4 edge. However, Smith leads in overall number of sub-2:04 swims in the 200 back, with four compared to McKeown’s three. In the 100-meter backstroke, Smith has broken 57.5 seconds six times, McKeown seven times, suggesting extraordinary parity. Their respective personal bests—Smith’s 57.13 and McKeown’s 57.03 in the 100, Smith’s 2:03.87 and McKeown’s 2:03.85 in the 200—are separated by mere hundredths.

SwimSwam’s detailed coverage of their meetings highlights how each athlete forces the other to extend beyond previous limits. McKeown’s underwater power often gives her an early advantage, while Smith’s longer stroke and superior back-half speed allow her to close strong. Analysts note that the rivalry has elevated both swimmers’ average speed; their races in 2023 and 2024 are consistently faster than those from 2021, demonstrating a classic performance arms race.

Psychological Edge and Mutual Respect

Neither swimmer has ever publicly disparaged the other. In interviews, Smith has repeatedly called McKeown “incredible” and credited her for pushing the standard higher. McKeown has similarly praised Smith’s resilience. After the 2023 worlds, McKeown remarked, “Regan is one of the best in history. Every time we race, I know I have to be at my absolute best or I’ll lose.” This mutual respect is typical of elite sporting rivalries, but the intensity remains palpable every time they step onto the blocks. In sideline interactions, they are often seen exchanging brief nods or smiles, yet once the race begins, their focus is absolute.

Smith’s coach Bob Bowman once noted that the rivalry “forces both athletes to race not just the clock but each other’s strengths and weaknesses. It’s a chess match played at 2.0 meters per second.” That chess match has produced four of the six fastest 200-meter backstroke times ever recorded. Bowman also observed that the mental preparation for each race has become a game of adjustments: Smith studies McKeown’s turn patterns and breakouts, while McKeown’s camp reportedly analyzes Smith’s stroke rate and breathing patterns. This cat-and-mouse dynamic extends beyond the pool deck, with both athletes using media comments and training leaks as psychological tools.

The Technical Duel: Underwaters and Turns

One often-overlooked aspect of the Smith-McKeown rivalry is its technical dimension. McKeown is known for an aggressive underwater dolphin kick that extends beyond the 15-meter mark—typically around 13 to 14 meters per turn—while Smith uses a shorter underwater phase but with greater power per kick. In the 200-meter backstroke, this differential is critical: McKeown often builds a lead of half a second at the 100-meter mark due to her turn efficiency, but Smith’s superior aerobic base and longer stroke allow her to close that gap in the final 50 meters. At the 2023 World Championships, McKeown’s underwater segment times were consistently 0.2–0.3 seconds faster per turn than Smith’s, yet Smith maintained a 0.1-second advantage in surface swimming pace. These micro-battles within each race highlight the depth of the rivalry and why no single event has been settled by more than a second since 2021.

Domestic Battles: Lydia Jacoby and the U.S. Swimming Pipeline

While McKeown represents Smith’s primary international rival, her domestic clashes with fellow American Lydia Jacoby have also shaped her career. Jacoby, who famously won Olympic gold in the 100-meter breaststroke at Tokyo, is primarily a breaststroker, but she and Smith have faced off in the 100-meter backstroke, the 4×100-meter medley relay, and individual medley events at U.S. Nationals and collegiate competitions. Their rivalry is less frequent but no less meaningful, as both represent the next wave of American women’s swimming.

Head-to-Head at National Championships

At the 2021 U.S. Olympic Trials, Smith and Jacoby both qualified for the Tokyo team, though they competed in different primary strokes. Their paths crossed most directly in the 100-meter backstroke at the 2022 Phillips 66 National Championships, where Smith won in 58.35 and Jacoby placed fifth. More notably, they have been teammates on the victorious 4×100-meter medley relay at both the 2022 and 2023 World Championships, where their combined talents – Smith’s backstroke leg, Jacoby’s breaststroke leg – helped the U.S. dominate. However, behind the scenes, there is a quiet competition for leadership on the U.S. women’s team, with both swimmers vying to be the face of the program. At the 2023 U.S. Nationals, Jacoby swam the 100-meter breaststroke in 1:05.05, while Smith clocked 58.87 in the 100 back; their combined relay splits were the fastest in the world that year.

Jacoby’s rise has motivated Smith during training camps and relay camps. “Lydia brings so much energy and a winning mentality,” Smith said in a 2023 interview with Olympics.com. “When we’re competing in the same race, it pushes me to be sharper technically because I know how good she is off the walls.” Jacoby, for her part, has described Smith as “the gold standard for American backstroke.” Their rivalry extends to the 200-meter individual medley, where they have clashed at U.S. Nationals and collegiate dual meets, with Smith holding a slight edge in overall wins (3–2 as of early 2025).

Collegiate Connections and Training Battles

Both Smith and Jacoby have committed to collegiate programs—Smith at the University of Texas (initially Stanford, later transferring) and Jacoby at the University of Texas as well. This shared team environment adds a unique layer to their rivalry. They train together under the same coaching staff, pushing each other in practice sets. At the 2024 NCAA Championships, Smith and Jacoby were part of the Texas women’s team that won the national title. Their intra-squad battles in the 100-yard backstroke and 200-yard individual medley have become highlights of the college season, with Smith typically edging Jacoby in the backstroke events but Jacoby often outperforming Smith in breaststroke-heavy sets. This continuous friction keeps both athletes sharp and prevents the stagnation that can occur without strong domestic competition.

Other Notable Rivals: Masse, MacNeil, and the New Generation

Beyond McKeown and Jacoby, Smith has engaged in meaningful rivalries with Canadian Kylie Masse and Canadian-American Margaret MacNeil. Masse, the world champion in 2017 and Olympic silver medalist in 2021, provided Smith’s toughest early tests. Their races at the 2019 Worlds (where Masse won bronze, Smith gold) and the 2021 Olympics (Masse silver, Smith bronze) demonstrated Smith’s ability to handle pressure from a seasoned competitor. Masse’s steady presence on the international stage served as a benchmark for Smith’s own development; at the 2022 Worlds, Smith defeated Masse in the 100 back (58.54 to 58.95) and 200 back (2:05.93 to 2:07.30), signaling a generational shift.

MacNeil, who won Olympic gold in the 100-meter butterfly and bronze in the 100-meter backstroke, has raced Smith in both events, though their rivalry is less defined by frequency. Nonetheless, Smith has praised MacNeil’s versatility, noting that “Maggie’s ability to switch between fly and back makes her a dangerous competitor in the medley events.” At the 2022 Short Course Worlds, Smith defeated MacNeil in the 100-meter backstroke, but MacNeil returned the favor in the 200-meter individual medley. More recently, at the 2023 World Championships, Smith and MacNeil met in the 100-meter backstroke semifinals, with Smith advancing and MacNeil failing to make the final—a result that highlighted Smith’s growing dominance in that event.

The emergence of younger swimmers like Canada’s Summer McIntosh and Australia’s Mollie O’Callaghan has also added new dimensions to Smith’s rivalries. McIntosh, who excels in the 200-meter butterfly and individual medley, has clashed with Smith in the 200-meter fly at recent meets, with McIntosh holding the edge in 2023 and 2024. O’Callaghan, a freestyle and backstroke specialist, has not yet faced Smith in a major final, but their paths may cross as both continue to expand their programs. Smith’s ability to adapt to different competition styles will be tested as the talent pool deepens heading into the 2028 Olympics.

Impact on Smith’s Training and Performance

The pressure of these rivalries has directly influenced Smith’s training regimen. Under Bowman, she increased her weekly yardage from 45,000 to 60,000 meters, with an emphasis on backstroke-specific drills, underwaters, and pace work. Bowman has stated that the presence of McKeown “eliminates any complacency. Regan knows that if she misses a week of training, Kaylee will be faster.” This competitive dynamic has yielded several record-breaking swims, including Smith’s American record in the 200-meter back (2:03.87) and her 100-meter back personal best of 57.13, achieved at the 2024 U.S. Olympic Trials. Additionally, Smith has incorporated more race-pace sets directly modeled on McKeown’s splits, simulating head-to-head conditions in practice.

Smith’s performances in the 200-meter individual medley have also benefited. Her rivalry with McKeown, who also excels in the IMs, pushed Smith to improve her breaststroke and butterfly splits. At the 2023 Pan American Games, Smith won gold in the 200-meter IM with a time of 2:09.28, a mark that was only 0.11 seconds off McKeown’s winning time at the 2023 Worlds. At the 2024 U.S. Olympic Trials, Smith further lowered her IM personal best to 2:07.51, just 0.45 seconds behind McIntosh’s best. The narrowing gap suggests that Smith’s all-around swimming is rising in response to the challenges posed by her rivals. This cross-event improvement has made Smith a threat not only in backstroke but also in medley events, adding more opportunities for head-to-head meetings in Paris and beyond.

Bowman has also tweaked Smith’s training periodization to peak for the specific dates of major competitions where McKeown is likely to be present. For example, in 2023, Smith’s taper was adjusted to match the timing of the World Championships rather than the U.S. Nationals alone, a shift that directly acknowledges the rivalry. Smith has also increased her emphasis on recovery and nutrition, recognizing that the mental and physical toll of racing McKeown three or four times a year requires sustained peak fitness. The results speak for themselves: Smith has not missed a World Championship or Olympic final since 2019, a consistency rate that rivals any swimmer in the world.

Media Coverage and Fan Interest

The Smith-McKeown rivalry has become a major draw for viewership. World Aquatics has highlighted their matchups as “box-office moments” that increase engagement during World Championship sessions. In Fukuoka 2023, the women’s 200-meter backstroke final drew an estimated 4.5 million live viewers worldwide, a 30% increase over the 2022 final. Social media reactions on platforms like X (formerly Twitter) and Instagram spike during their races, with fan accounts dissecting every turn and stroke rate difference. The narrative of two athletes from rival nations—Australia and the United States—adds a patriotic layer that amplifies interest. Broadcasters frequently replay their 2021 Olympic and 2022 World Championship clashes as teaser content, capitalizing on the built-up anticipation.

Smith has acknowledged the added pressure but says she uses it to stay focused. “I try to block out the noise,” she told NBC Sports in 2024. “But when I’m racing Kaylee or anyone else, I honor the rivalry by giving my absolute effort. That’s what fans deserve to see.” McKeown has similarly stated that the attention “makes the sport better. When people tune in to watch us race, it shows that women’s backstroke is where the excitement is.” The financial impact is also notable: sponsors have increased endorsement offers to both athletes, and their matchups are often scheduled in primetime slots during World Championships and Olympic broadcasts.

Beyond mainstream coverage, specialized swimming outlets like SwimSwam, Swimming World, and FINA’s official magazine have devoted extensive analytical articles to the rivalry. USA Swimming’s athlete profile of Smith notes that her rivalry with McKeown is “the most closely watched duel in the sport today.” This media environment has turned every Smith-McKeown race into a mini-event, complete with pre-race predictions, mid-race reaction threads, and post-race analysis that often continues for weeks.

What’s Next: Paris 2024 and Beyond

As Smith prepares for the 2024 Paris Olympics, the rivalry with McKeown shows no signs of cooling. Smith enters as the reigning world champion in the 100-meter backstroke (2024 Worlds in Doha) and the American record holder in the 200-meter back. McKeown, meanwhile, is the defending Olympic champion in both events and holds the world records in the 100 and 200 back. Their potential meetings in Paris are widely anticipated as the swimming events’ marquee matchups. Pre-race analysis by SwimSwam projects that both swimmers could be even faster in Paris due to the pool’s depth and turn-friendly lane design. A comparison of their 2024 season bests shows Smith at 57.13 in the 100 back and McKeown at 57.21, with Smith also holding the edge in the 200 back (2:03.87 to McKeown’s 2:04.06). These razor-thin margins set up what could be the most dramatic Olympic races of the decade.

Smith has also expanded her program to include the 200-meter butterfly and the 200-meter individual medley, where she could face McKeown again as well as emerging rivals like Canada’s Summer McIntosh. In the 200 IM, Smith’s time of 2:07.51 ranks her third in the world behind McIntosh (2:06.02) and McKeown (2:06.65). This diversification hedging against the risk of losing focus on any single event and keeps Smith’s training dynamic. If she medals in three individual events in Paris, she would join an elite club of American women who have achieved multi-event success at a single Olympics.

Beyond Paris, the rivalry is expected to continue through the 2025 World Championships in Singapore and the 2028 Los Angeles Olympics, where both swimmers will be in their prime years. Younger swimmers like the United States’ Claire Curzan and Australia’s Jaclyn Barclay are also emerging, potentially creating a multi-athlete rivalry landscape. For Smith, the rivalries are not merely obstacles but catalysts for greatness. “The greatest swimmers in history had rivals,” she once said. “I want to be part of that tradition. I want to be remembered as someone who raced and beat the best.” Whether she adds Olympic gold to her collection in Paris or not, her legacy as a fearless competitor defined by these battles is already secure.

Conclusion: The Fire That Fuels Greatness

Regan Smith’s career is a case study in how elite rivalries elevate performance. From the white-hot duels with Kaylee McKeown to the domestic sparring with Lydia Jacoby and the measured clashes with Kylie Masse and Margaret MacNeil, every head-to-head has sharpened her technique, tested her mental fortitude, and pushed the limits of what is possible in backstroke and medley swimming. The technical analysis of their races reveals a sport evolving in real time, with each athlete forcing the other to refine their weaknesses. As she continues to lower personal bests and rewrite American record books, Smith embodies the competitive spirit that makes swimming a compelling spectator sport.

The next chapter, likely featuring the 2024 Paris Games and beyond, promises more tight finishes, more world records, and more moments that remind us why rivalries are the lifeblood of sports. For Regan Smith, the challenge is not just to win – it’s to be part of a legacy of rivalry that inspires the next generation to dive in and chase the same fiery dream. Her story, interwoven with those of her competitors, stands as a testament to the power of shared ambition and the relentless pursuit of excellence. In the end, the history of Regan Smith’s rivalries is the history of swimming itself—a record of human limits being redrawn, second by second, stroke by stroke.