Appearances or Games Pitched is the statistic used to track the number of games a pitcher plays in.
| All Time Leaders | |||
|---|---|---|---|
| Span | Player | Total | Notes |
| Career | Jesse Orosco | 1,252 | |
| Season | Mike Marshall | 106 | 1974 |
| NPB Career | Tetsuya Yoneda | 949 | |
| NPB Season | Tomoyuki Kubota | 90 | 2007 |
| Minor League Career | Bill Thomas | 1,016 | |
| Hoofdklasse Career | Rob Cordemans | 334+ | As of Sept. 2020 |
| AAGPBL Career | Helen Nicol Fox | 313 | |
| AAGPBL Season | Anna May Hutchison | 51 | 1946 |
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Win Expectancy, Run Expectancy, and Leverage Index calculations provided by Tom Tango of InsideTheBook.com, and co-author of The Book: Playing the Percentages in Baseball.
Total Zone Rating and initial framework for Wins above Replacement calculations provided by Sean Smith.
Full-year historical Major League statistics provided by Pete Palmer and Gary Gillette of Hidden Game Sports.
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