Not enough days in 1991 season to compile WAA record.
| Date | Rank | WAA | TeamID |
|---|---|---|---|
| 19910418 | XXXXX | 0.15 | TEX |
| 19910502 | XXXXX | 0.91 | TEX |
| 19910516 | +017+ | 1.86 | TEX |
| 19910530 | +008+ | 2.85 | TEX |
| 19910613 | +007+ | 3.58 | TEX |
| 19910627 | +006+ | 4.35 | TEX |
| 19910714 | +012+ | 4.35 | TEX |
| 19910728 | +012+ | 4.81 | TEX |
| 19910811 | +009+ | 5.56 | TEX |
| 19910825 | +009+ | 5.91 | TEX |
| 19910908 | +008+ | 6.72 | TEX |
| 19910922 | +007+ | 7.43 | TEX |
| 19911006 | +008+ | 7.73 | TEX |
Ruben Sierra Post Season Games
| Rank | WAA | BA | OBP | PA | Rbis | Runs | Tm |
|---|---|---|---|---|---|---|---|
| XXXXX | 0.55 | 0.333 | 0.357 | 28 | 7 | 4 | OAK |
| XXXXX | 0.32 | 0.239 | 0.325 | 77 | 14 | 5 | NYA |
| XXXXX | 0.86 | 0.264 | 0.333 | 105 | 21 | 9 | TOT |
_