| Team | Tm | Tier | Game |
|---|---|---|---|
| New York Mets | NYN | 3.41 | 199005030_CIN_NYN |
| Oakland Athletics | OAK | 2.61 | 199005050_BOS_OAK |
| Houston Astros | HOU | 2.58 | 199005050_HOU_NYN |
| Cincinnati Reds | CIN | 1.74 | 199005050_CIN_SLN |
| Cleveland Indians | CLE | 1.12 | 199005030_CLE_NYA |
| Team | Tm | Tier | Game |
|---|---|---|---|
| California Angels | ANA | -3.7 | 199005030_ANA_SEA |
| San Francisco Giants | SFN | -3.06 | 199005050_SFN_WAS |
| Atlanta Braves | ATL | -2.37 | 199005030_ATL_WAS |
| Detroit Tigers | DET | -0.78 | 199005040_DET_TOR |
| St. Louis Cardinals | SLN | -0.74 | 199005050_CIN_SLN |
Based on accumulated WAA for this season up to 1990-05-05.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +016+ | 1.47 | Rob Dibble | 16.7 | CIN |
| +019+ | 1.36 | Mark Eichhorn | 20.3 | ANA |
| +021+ | 1.29 | Terry Leach | 14.3 | MIN |
| XXXXX | 1.24 | Gregg Olson | 14.3 | BAL |
| XXXXX | 1.22 | Paul Assenmacher | 20.7 | CHN |
| XXXXX | 1.21 | Duane Ward | 18 | TOR |
| XXXXX | 1.16 | Mitch Williams | 13 | CHN |
| XXXXX | 1.13 | Greg Harris | 19.7 | SDN |
| XXXXX | 1.05 | Ted Power | 11.7 | PIT |
| XXXXX | 1.04 | Doug Jones | 11.3 | CLE |
| XXXXX | 1.03 | Juan Agosto | 14.3 | HOU |
| XXXXX | 1.01 | Wayne Edwards | 14 | CHA |
| XXXXX | 0.97 | Dennis Eckersley | 11.3 | OAK |
| XXXXX | 0.97 | Don Carman | 13 | PHI |
| XXXXX | 0.92 | Jeff Reardon | 10.3 | BOS |
| XXXXX | 0.91 | Larry Andersen | 15.3 | HOU |
| XXXXX | 0.82 | Dan Schatzeder | 14.3 | HOU |
| XXXXX | 0.79 | Dave Smith | 14 | HOU |
| XXXXX | 0.78 | Bill Landrum | 11 | PIT |
| XXXXX | 0.78 | Barry Jones | 11.3 | CHA |
| XXXXX | 0.75 | Ken Dayley | 8.3 | SLN |
| XXXXX | 0.75 | Darrel Akerfelds | 8.3 | PHI |
| XXXXX | 0.75 | Keith Comstock | 10.7 | SEA |
| XXXXX | 0.75 | Bob Patterson | 10.7 | PIT |
| XXXXX | 0.73 | Dave Wells | 10.3 | TOR |
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