John Costello
Batting
Baseball Reference Page
| Team | Year | Adj IP | W | L | BB | SO | ERA | RPG | Runs | Tot | R/IP | TE |
| SLN | 1988 | 49.8 | 5 | 2 | 25 | 38 | 1.81 | -0.242 | 24.4 | 24.0 | 0.489 | 0.465 |
| SLN | 1989 | 59.7 | 5 | 4 | 20 | 40 | 3.32 | -0.269 | 29.4 | 28.7 | 0.493 | 0.460 |
| MON | 1990 | 5.5 | 0 | 0 | 1 | 1 | 5.68 | | 1.5 | 1.5 | 0.269 | 0.272 |
| SLN | 1990 | 4.7 | 0 | 0 | 1 | 1 | 6.23 | | 1.6 | 1.6 | 0.346 | 0.348 |
| SDN | 1991 | 36.3 | 1 | 0 | 17 | 24 | 3.09 | -0.132 | 18.3 | 18.2 | 0.503 | 0.492 |