Roy Mahaffey
Batting
Baseball Reference Page
| Team | Year | Adj IP | W | L | BB | SO | ERA | RPG | Runs | Tot | R/IP | TE |
| PIT | 1926 | 4.9 | 0 | 0 | 1 | 3 | 0.00 | -0.803 | 2.9 | 2.4 | 0.593 | 0.425 |
| PIT | 1927 | 9.3 | 1 | 0 | 9 | 4 | 7.71 | 0.485 | 3.5 | 4.0 | 0.381 | 0.391 |
| PHA | 1930 | 152.9 | 9 | 5 | 53 | 38 | 5.01 | -0.235 | 66.9 | 62.8 | 0.437 | 0.369 |
| PHA | 1931 | 159.4 | 15 | 4 | 82 | 59 | 4.21 | 0.076 | 72.9 | 74.3 | 0.457 | 0.419 |
| PHA | 1932 | 221.4 | 13 | 13 | 96 | 106 | 5.09 | -0.072 | 105.3 | 103.6 | 0.476 | 0.421 |
| PHA | 1933 | 179.8 | 13 | 10 | 74 | 66 | 5.17 | 0.009 | 108.3 | 108.5 | 0.603 | 0.549 |
| PHA | 1934 | 128.2 | 6 | 7 | 55 | 37 | 5.37 | 0.200 | 61.6 | 64.0 | 0.481 | 0.457 |
| PHA | 1935 | 134.6 | 8 | 4 | 42 | 39 | 3.90 | -0.070 | 64.5 | 63.5 | 0.479 | 0.426 |
| SLA | 1936 | 60.8 | 2 | 6 | 40 | 13 | 8.10 | -0.247 | 23.5 | 22.2 | 0.386 | 0.337 |