Context:Little is known about pitching performance or lack of it among Major League Baseball (MLB) pitchers who undergo operative treatment of rotator cuff tears.Objective: To assess pitching performance outcomes in MLB players who needed operative treatment of rotator cuff tears and to compare performance in these athletes with that in a control group of MLB players.Design: Case-control study. Setting: Publicly available player profiles, press releases, and team injury reports.Patients or Other Participants: Thirty-three MLB pitchers with documented surgery to treat rotator cuff tears and 117 control pitchers who did not have documented rotator cuff tears were identified.Main Outcome Measure(s): Major League Baseball pitching attrition and performance variables.Results: Players who underwent rotator cuff surgery were no more likely not to play than control players. Performance variables of players who underwent surgery improved after surgery but never returned to baseline preoperative status. Players who needed rotator cuff surgery typically were more experienced and had better earned run averages than control players.Conclusions: Pitchers who had symptomatic rotator cuff tears that necessitated operative treatment tended to decline gradually in performance leading up to their operations and to improve gradually over the next 3 seasons. In contrast to what we expected, they did not have a greater attrition rate than their control counterparts; however, their performances did not return to preoperative levels over the course of the study.Key Words: pitching, clinical outcome, shoulder Key Points• Pitchers who had operative treatment of symptomatic rotator cuff tears tended to have a gradual decline in performance before surgery and to improve gradually over the 3 seasons after surgery. • The attrition rate was not greater in pitchers who had operative treatment than in the control pitchers.• Pitchers who had surgery for rotator cuffs tears did not return to their preoperative performance levels during the study period.R otator cuff tears (RCTs) can cause great pain and dysfunction in both work-related and non-work-related activities of daily living, as well as loss of shoulder motion and strength. Without treatment, full-thickness RCTs can be career-ending injuries for professional athletes. Although tears often occur in patients aged 40 years and 0Ider,1.2 overhead athletes, particularly professional baseball pitchers, present a unique cohort of athletes at great risk for this type of overuse lllJury.Professional baseball pitchers subject the rotator cuff to supraphysiologic loads that lead to rotator cuff tendinitis, partialthickness RCTs, and, in advanced stages, full-thickness RCTs.3-5 At one time, RCT was considered a career-ending injury for a Major League Baseball (MLB) pitcher. As the approach to the operative and nonoperative management of RCTs in athletes has evolved over the past 3 decades, the goal of operative treatment of partial-thickness and full-thickness tears in these elite-level athletes also...