John Costello
| Date | Team | Opponent | Result | IP | H | R | ER | BB | SO | PA | 2B | 3B | HR | GO | FO | MISC |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1991-05-09 | SDP | vs. PHI | L, 9-6 | 2.0 | 3 | 1 | 1 | 0 | 1 | 9 | 0 | 0 | 1 | 1 | 4 | RP |
| 1991-05-11 | SDP | vs. MON | L, 5-1 | 1.0 | 1 | 0 | 0 | 1 | 1 | 4 | 0 | 0 | 0 | 1 | 0 | RP |
| 1991-05-12 | SDP | vs. MON | L, 8-6 | 1.1 | 3 | 1 | 1 | 1 | 1 | 8 | 0 | 1 | 0 | 2 | 1 | RP |
| 1991-05-18 | SDP | @ CIN | W, 5-2 | 1.0 | 0 | 0 | 0 | 1 | 1 | 4 | 0 | 0 | 0 | 0 | 2 | RP |
| 1991-05-19 | SDP | @ CIN | W, 3-2 | 1.0 | 0 | 0 | 0 | 1 | 1 | 4 | 0 | 0 | 0 | 1 | 1 | RP |
| 1991-05-23 | SDP | @ ATL | W, 11-10 | 1.0 | 2 | 1 | 1 | 0 | 1 | 5 | 0 | 0 | 0 | 0 | 2 | RP |
| 1991-05-25 | SDP | @ HOU | W, 4-2 | 0.1 | 1 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 0 | 0 | RP |
| 1991-05-28 | SDP | vs. ATL | L, 8-6 | 0.0 | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | RP |
| 1991-06-04 | SDP | @ CHC | W, 7-1 | 1.0 | 2 | 1 | 0 | 0 | 1 | 6 | 0 | 0 | 0 | 0 | 2 | RP |
| 1991-06-08 | SDP | @ PIT | W, 11-0 | 2.1 | 2 | 0 | 0 | 3 | 0 | 12 | 1 | 0 | 0 | 2 | 5 | RP |
| 1991-06-11 | SDP | vs. STL | L, 10-4 | 0.1 | 1 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 0 | 1 | RP |
| 1991-06-13 | SDP | vs. STL | L, 12-1 | 2.0 | 2 | 4 | 2 | 2 | 0 | 10 | 0 | 0 | 0 | 2 | 2 | RP |
| 1991-06-24 | SDP | @ STL | W, 4-1 | 1.0 | 0 | 0 | 0 | 0 | 2 | 3 | 0 | 0 | 0 | 1 | 0 | RP |
| 1991-06-26 | SDP | @ CIN | L, 6-2 | 1.0 | 1 | 0 | 0 | 0 | 0 | 3 | 0 | 0 | 0 | 1 | 0 | RP |
| 1991-07-03 | SDP | vs. LAD | L, 6-3 | 2.0 | 2 | 0 | 0 | 1 | 2 | 8 | 0 | 0 | 0 | 1 | 2 | RP |
| 1991-07-12 | SDP | @ NYM | L, 6-3 | 2.0 | 3 | 2 | 2 | 0 | 2 | 9 | 0 | 0 | 1 | 2 | 2 | RP |
| 1991-07-16 | SDP | @ MON | W, 4-3 | 0.1 | 1 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 0 | 0 | RP |
| 1991-07-20 | SDP | vs. PHI | L, 4-0 | 1.0 | 1 | 0 | 0 | 0 | 1 | 4 | 0 | 0 | 0 | 0 | 2 | RP |
| 1991-07-24 | SDP | vs. MON | L, 8-2 | 2.0 | 2 | 0 | 0 | 2 | 2 | 10 | 0 | 0 | 0 | 3 | 1 | RP |
| 1991-07-27 | SDP | vs. NYM | L, 4-0 | 3.0 | 0 | 0 | 0 | 2 | 0 | 10 | 0 | 0 | 0 | 3 | 2 | RP |
| 1991-07-31 | SDP | @ PHI | L, 9-3 | 1.0 | 3 | 3 | 3 | 1 | 0 | 7 | 2 | 0 | 0 | 1 | 2 | RP |
| 1991-08-04 | SDP | @ ATL | L, 9-7 | 0.1 | 3 | 2 | 2 | 0 | 0 | 4 | 1 | 0 | 0 | 0 | 1 | RP |
| 1991-08-06 | SDP | @ HOU | L, 6-1 | 2.1 | 0 | 0 | 0 | 1 | 2 | 9 | 0 | 0 | 0 | 2 | 3 | RP |
| 1991-09-18 | SDP | vs. ATL | L, 6-4 | 0.1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 1 | RP |
| 1991-09-20 | SDP | vs. SFG | W, 10-5 | 2.1 | 1 | 0 | 0 | 1 | 2 | 9 | 0 | 0 | 0 | 2 | 3 | RP, W |
| 1991-09-28 | SDP | @ CIN | W, 4-2 | 2.0 | 1 | 0 | 0 | 0 | 3 | 7 | 0 | 0 | 0 | 1 | 2 | RP |
| 1991-10-05 | SDP | vs. CIN | W, 10-7 | 1.0 | 1 | 0 | 0 | 0 | 1 | 4 | 0 | 0 | 0 | 2 | 0 | RP |
| Total Games: 27 | ||||||||||||||||