The Role of Pitch Count and Rest Days in Extending Jacob deGrom's Career Longevity

Jacob deGrom is widely regarded as one of the most talented pitchers in Major League Baseball history. With two Cy Young Awards, a career ERA under 2.50 during his peak, and a fastball that still touches 100 mph in his late 30s, deGrom has produced numbers that rival the all-time greats. Yet his career has been repeatedly interrupted by injuries—most notably forearm strains, elbow issues, shoulder tightness, and a partial tear of the ulnar collateral ligament that eventually required Tommy John surgery in 2023. These setbacks have forced fans and analysts to ask a pressing question: Could smarter management of pitch count and rest days have extended his prime even further?

The relationship between workload, recovery, and pitcher health has become one of the most studied topics in sports medicine. For a pitcher with deGrom's explosive delivery and high-velocity stuff, the margin for error is razor-thin. Every extra pitch, every short rest start, and every inning thrown while fatigued increases the risk of structural damage. This article examines the science behind pitch count management, the role of rest days in tendon and ligament recovery, and the specific strategies that teams—including the Texas Rangers and New York Mets—have employed to maximize deGrom's availability while protecting his arm.

The Anatomy of Pitching Stress

To understand why pitch count and rest matter, one must first understand the forces at play during a single pitch. When a pitcher throws a fastball, the shoulder rotates internally at speeds exceeding 7,000 degrees per second. The elbow experiences a valgus load—a force that pulls the inside of the elbow apart—of approximately 70 Newton-meters, nearing the tensile limits of the ulnar collateral ligament (UCL). Every repetition, particularly when the arm is fatigued, micro-damages the connective tissue.

Jacob deGrom's mechanics amplify these stresses. His stride length, hip-shoulder separation, and late arm acceleration generate elite velocity but also place extraordinary torque on his medial elbow structures. According to MLB's pitch count guidelines for youth pitchers, a teenager throwing more than 75 pitches in a game faces a 35% increased risk of elbow injury. For a professional throwing in the mid-to-upper 90s with max effort, the cumulative wear is far greater.

Pitch count, therefore, is not merely a number—it is a proxy for accumulated mechanical stress. Studies published in the American Journal of Sports Medicine have shown that pitchers who exceed 100 pitches in a game are 2.1 times more likely to require elbow surgery within the following year. For deGrom, who regularly exceeded 110 pitches during his 2018–2021 Cy Young seasons, the data suggests he was operating in a high-risk zone.

Pitch Count Management: From Start Limits to Season Totals

Game-Level Pitch Counts

The most immediate form of workload control is limiting pitches per start. During deGrom's tenure with the Mets, the team often allowed him to stay in games deep into the seventh or eighth inning, particularly when he was dominating. In his 2018 Cy Young season, deGrom averaged 103.4 pitches per start over 32 outings. In 2019, that number climbed to 104.1. While these figures are not extreme by historical standards, they become significant when combined with deGrom's high-stress, high-velocity delivery.

Since returning from Tommy John surgery in 2024, the Texas Rangers have enforced firmer pitch limits, often capping deGrom at 85–90 pitches during his first few months back. This approach mirrors recommendations from leading orthopedic surgeon Dr. James Andrews, who advocates for strict pitch counts even for professional pitchers returning from injury. The logic is straightforward: healed tissue needs gradual reconditioning, and exceeding a safe threshold can lead to compensatory mechanics that invite new injuries.

Seasonal Innings Caps

Beyond single-game counts, teams also monitor total innings thrown across a season. For deGrom, the Rangers have implemented an innings limit of roughly 150–160 for 2024, with the goal of having him healthy for a potential playoff run. This strategy is supported by research from Fangraphs and other analytics platforms, which have found that pitchers who increase their inning totals by more than 30 from the previous season face a significantly higher injury rate. By managing the cumulative load, teams can reduce the odds of overuse breakdowns.

The Role of High-Stress vs. Low-Stress Pitches

Not all pitches are created equal. A 3-2 fastball with the bases loaded demands maximal effort, while a 6-0 count-changeup in a blowout might be thrown at 80% intensity. Advanced tracking systems like Statcast allow teams to classify pitches by "stress level" based on velocity, movement, and game situation. For deGrom, early-career pitch counts often included a high proportion of high-stress pitches because of his tendency to work out of jams. Modern management aims to reduce those spikes by pulling him earlier in high-leverage innings or limiting his pitch count in games where the team builds a large lead.

Rest Days: The Recovery Window

Standard Four-Day Rest vs. Extended Recovery

Major League Baseball's typical schedule gives starting pitchers four days of rest between starts. For most of his career, deGrom operated on this rotation. However, research from the American Sports Medicine Institute (ASMI) has shown that UCL recovery time after a high-volume start can exceed 72 hours. On a four-day cycle, the pitcher begins his next start with the UCL still in a suboptimal repair state. Over a full season, this cumulative deficit may contribute to microtearing and eventual failure.

In 2022, the Mets experimented with giving deGrom an extra day of rest whenever possible—effectively a five-day rotation. The results were encouraging: deGrom made 11 starts with a 1.08 ERA and a strikeout rate of 47.5%, but he still landed on the injured list with a stress reaction in his scapula. This suggests that rest alone cannot solve all injury problems if workload intensity remains high.

Bullpen Sessions and Active Recovery

Rest days are not idle days. Between starts, pitchers engage in bullpen sessions, long toss, and strength work. The volume and intensity of these sessions also affect recovery. For deGrom, his between-start routines were legendary for their intensity—often featuring long-toss distances exceeding 300 feet and bullpen sessions that mimicked game effort. While this approach kept his mechanics sharp, it also added stress on his arm without the recovery benefits of a lighter program.

The Rangers have since collaborated with deGrom's personal trainer and the team's sports science staff to reduce between-start workload. Bullpen sessions are now capped at 25–30 pitches, with emphasis on command rather than velocity. This shift acknowledges that recovery is an active process, not merely the absence of competition.

The Six-Man Rotation Concept

Several analysts have proposed that Jacob deGrom and other injury-prone aces would benefit from a six-man rotation, which provides an extra rest day each turn. The Los Angeles Dodgers have used this model effectively for pitchers like Clayton Kershaw and Tyler Glasnow. For deGrom, a six-man rotation would reduce his annual appearances from roughly 32 to 27, potentially preserving his arm for a full season. While this decreases total innings, the trade-off could be a longer, healthier career—something deGrom himself has indicated he values over raw counting stats.

Strategies for Effective Workload Management

Based on the evidence from deGrom's career and broader MLB injury trends, the following strategies represent best practices for extending pitcher longevity:

  • Individualized Pitch Count Thresholds: Rather than a rigid 100-pitch limit, teams should determine each pitcher's "fatigue point" using real-time velocity drops, spin rate dips, and biomechanical markers. For deGrom, early signs of fatigue appear around pitch 85, making that a natural cutoff.
  • Mandatory Rest After High-Stress Outings: When a start includes more than a certain number of high-intensity pitches (e.g., pitches thrown with maximum effort in high-leverage situations), the pitcher should receive an extra day of rest regardless of pitch count.
  • Lower Inning Caps for Velocity-Dominated Pitchers: Pitchers who throw 95 mph or higher should have stricter innings limits than finesse pitchers, given the elevated joint torques. Teams should target no more than 180 innings per season for such arms, with further reductions after injury.
  • Built-In Sprints and Deload Weeks: Analogous to weightlifting periodization, a pitching season should incorporate weeks where workload is intentionally reduced—such as a start skipped or pitch counts cut by 30%—to allow connective tissue to fully regenerate.
  • Use of Wearable Technology: Devices such as Motus sleeves or inertial measurement units can monitor elbow torque and arm slot changes in real time. When a pitcher's elbow torque exceeds a personalized baseline, coaching staff can intervene mid-game. The Rangers have adopted this technology for deGrom's rehab starts.
  • Collision Between Front Office and Player Preference: Pitchers often resist being pulled early, especially when they are dealing. The most effective strategies require clear communication and buy-in. In deGrom's case, the Rangers have emphasized that preserving his velocity and health for a deep postseason run is the shared goal, making early exits more acceptable.

Case Studies: Comparing deGrom's Peers

Several MLB pitchers have successfully navigated workload management to achieve remarkable longevity. Justin Verlander, for example, underwent Tommy John surgery at age 34 and returned to win a Cy Young at 39. Verlander's teams consistently limited his spring training innings, provided extra rest during the season, and used data to monitor his revamped mechanics.

Similarly, Max Scherzer has maintained elite performance into his late 30s by adhering to a meticulous recovery regimen that includes contrast baths, massage, and a reduced bullpen schedule. Scherzer's career pitch count per start has actually declined in his later years, from an average of 106 in his prime to 99 in 2023.

In contrast, pitchers like Brandon Webb and Mark Prior saw their careers derailed by excessive workloads early on—Webb averaged 112 pitches per start in his age-27 season, Prior 118 in his age-23 season. Both suffered catastrophic shoulder and elbow injuries within two years. For deGrom, who already has a Tommy John revision, the lesson is clear: a single season of high pitch counts can carry consequences that persist for years, even with subsequent rest.

Challenges and Criticisms of Pitch Count Orthodoxy

Not everyone agrees that strict pitch counts and extra rest are the answer. Some pitching coaches argue that limiting elite pitchers too much prevents them from building the arm strength and endurance needed to survive a 162-game season. Others point out that injury rates have not noticeably decreased since the adoption of modern pitch count limits—suggesting that the problem may be rooted more in velocity and effort levels than in raw counts.

Furthermore, the rise of one-inning relievers has led to a different kind of injury: pitchers who throw at 100% intensity for a single inning but accumulate high-stress exposures very frequently. For deGrom, this is less relevant, but the broader debate highlights that no single variable—pitch count, rest, mechanics, or genetics—can fully explain injury risk. An effective plan must combine all factors.

Conclusion

Jacob deGrom's career stands as both a testament to dominance and a cautionary tale about the limits of the human arm. His arsenal—a fastball with elite ride, a slider with extreme horizontal break, and a changeup that fools even the best hitters—depends on a healthy elbow and shoulder. The evidence strongly suggests that disciplined management of pitch count and rest days has allowed deGrom to return from major surgery and still pitch at an All-Star level. However, the margin for error remains narrow. Each pitch beyond his optimal threshold carries risk, and each start on short rest compounds that risk.

For the Texas Rangers and for deGrom himself, the path forward involves a delicate balance: maximizing his impact on the mound while respecting the biological reality that tendons and ligaments need time to repair. By continuing to use data-driven pitch limits, scheduling extra rest, and monitoring recovery metrics, deGrom can extend his prime into his age-38 season and beyond. The rest of baseball, from youth leagues to the major leagues, would do well to adopt similar principles—because a healthy deGrom, even at 85 pitches per start, is far more valuable than an injured one on the shelf.