John Costello
Pitching
Baseball Reference Page
| Team | Year | Pos | AB | R | H | HR | RBI | AVG | RC | Def RP | Tot | RPG |
| SLN | 1988 | P | 5 | 0 | 0 | 0 | 0 | 0.000 | -0.5 | 0.1 | -0.4 | -0.242 |
| SLN | 1989 | P | 6 | 0 | 0 | 0 | 0 | 0.000 | -0.9 | 0.2 | -0.7 | -0.269 |
| SLN | 1990 | P | 0 | 0 | 0 | 0 | 0 | | 0.0 | 0.0 | 0.0 | |
| MON | 1990 | P | 0 | 0 | 0 | 0 | 0 | | 0.0 | 0.0 | 0.0 | |
| SDN | 1991 | P | 1 | 0 | 0 | 0 | 0 | 0.000 | -0.2 | 0.1 | -0.1 | -0.132 |