Mike Mussina had a record of 4-5 with an ERA of 2.87 and 52 strikeouts in 12 appearances in his rookie season in 1991.
| NAME | SEASON | TM | G | W | L | W% | GS | ERA | SO | CG | SHO | SV | IP | H | ER | R | HR | BB | HBP | GF | IBB | TBF | WP | K/9 | BB/9 | K/BB | HR/9 | K% | BB% | WHIP | BABIP | RA | ERA- | FIP | FIP- | H/9 | PRAA | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | M. Mussina | 1991 |  BAL | 12 | 4 | 5 | .444 | 12 | 2.87 | 52 | 2 | 0 | 0 | 87.2 | 77 | 28 | 31 | 7 | 21 | 1 | 0 | 0 | 349 | 3 | 5.34 | 2.16 | 2.48 | 0.72 | 14.9 | 6.0 | 1.12 | .261 | 3.18 | 72 | 3.45 | 85 | 7.90 | 5.7 |
Games
| NAME | DATE | SEASON | TM | OPP | DEC | GS | ERA | SO | CG | SHO | SV | IP | H | ER | R | HR | BB | HBP | GF | IBB | TBF | WP | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | | M. Mussina | 10/4/1991 | 1991 | BAL | vs |  DET | 1 | 1.00 | 7 | 0 | 0 | 0 | 9.0 | 4 | 1 | 1 | 0 | 3 | 0 | 0 | 0 | 32 | 0 | |
| 2 | | M. Mussina | 9/28/1991 | 1991 | BAL | @ | DET | 1 | 1.13 | 5 | 0 | 0 | 0 | 8.0 | 4 | 1 | 2 | 1 | 2 | 0 | 0 | 0 | 28 | 0 | |
| 3 | | M. Mussina | 9/22/1991 | 1991 | BAL | @ |  CLE | L | 1 | 2.16 | 3 | 1 | 0 | 0 | 8.1 | 7 | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 30 | 0 |
| 4 | | M. Mussina | 9/16/1991 | 1991 | BAL | @ |  BOS | W | 1 | 2.00 | 3 | 1 | 0 | 0 | 9.0 | 10 | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 34 | 0 |
| 5 | | M. Mussina | 9/11/1991 | 1991 | BAL | vs |  NYY | W | 1 | 1.29 | 3 | 0 | 0 | 0 | 7.0 | 6 | 1 | 2 | 0 | 1 | 0 | 0 | 0 | 28 | 1 |
| 6 | | M. Mussina | 9/6/1991 | 1991 | BAL | vs |  KCR | 1 | 2.45 | 3 | 0 | 0 | 0 | 7.1 | 5 | 2 | 2 | 1 | 1 | 0 | 0 | 0 | 28 | 0 | |
| 7 | | M. Mussina | 8/31/1991 | 1991 | BAL | @ |  MIN | L | 1 | 7.11 | 2 | 0 | 0 | 0 | 6.1 | 10 | 5 | 5 | 1 | 2 | 0 | 0 | 0 | 28 | 0 |
| 8 | | M. Mussina | 8/25/1991 | 1991 | BAL | vs | MIN | W | 1 | 2.25 | 4 | 0 | 0 | 0 | 8.0 | 7 | 2 | 3 | 0 | 4 | 0 | 0 | 0 | 35 | 0 |
| 9 | | M. Mussina | 8/19/1991 | 1991 | BAL | @ |  TEX | L | 1 | 6.35 | 8 | 0 | 0 | 0 | 5.2 | 6 | 4 | 4 | 2 | 2 | 0 | 0 | 0 | 24 | 0 |
| 10 | | M. Mussina | 8/14/1991 | 1991 | BAL | vs | TEX | W | 1 | 2.25 | 10 | 0 | 0 | 0 | 8.0 | 3 | 2 | 2 | 1 | 2 | 1 | 0 | 0 | 31 | 1 |
| 11 | | M. Mussina | 8/9/1991 | 1991 | BAL | vs |  CWS | L | 1 | 13.50 | 3 | 0 | 0 | 0 | 3.1 | 11 | 5 | 5 | 0 | 0 | 0 | 0 | 0 | 21 | 1 |
| 12 | | M. Mussina | 8/4/1991 | 1991 | BAL | @ | CWS | L | 1 | 1.17 | 1 | 0 | 0 | 0 | 7.2 | 4 | 1 | 1 | 1 | 4 | 0 | 0 | 0 | 30 | 0 |
| Total | 12 | 2.87 | 52 | 2 | 0 | 0 | 87.2 | 77 | 28 | 31 | 7 | 21 | 1 | 0 | 0 | 349 | 3 |
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