| Team | Tm | Tier | Game |
|---|---|---|---|
| Oakland Athletics | OAK | 6.49 | 199009240_OAK_KCA |
| Cincinnati Reds | CIN | 1.22 | 199009230_CIN_SDN |
| Chicago White Sox | CHA | 1.02 | 199009250_MIN_CHA |
| New York Mets | NYN | 0.98 | 199009250_NYN_WAS |
| Detroit Tigers | DET | 0.95 | 199009230_DET_OAK |
| Team | Tm | Tier | Game |
|---|---|---|---|
| Atlanta Braves | ATL | -4.86 | 199009230_HOU_ATL |
| Chicago Cubs | CHN | -3.71 | 199009250_CHN_PIT |
| Houston Astros | HOU | -2.01 | 199009230_HOU_ATL |
| San Francisco Giants | SFN | -0.89 | 199009240_SDN_SFN |
| Baltimore Orioles | BAL | -0.76 | 199009250_BAL_NYA |
Based on accumulated WAA for this season up to 1990-09-25.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +023+ | 5.19 | Dennis Eckersley | 69.7 | OAK |
| +029+ | 4.85 | Bill Swift | 123.7 | SEA |
| +030+ | 4.81 | Larry Andersen | 90.7 | TOT |
| +039+ | 4.42 | Rob Dibble | 94 | CIN |
| +045+ | 3.87 | Greg Harris | 114.3 | SDN |
| +048+ | 3.66 | Bobby Thigpen | 82.7 | CHA |
| +050+ | 3.5 | Randy Myers | 83.7 | CIN |
| +051+ | 3.47 | Jeff Montgomery | 91 | KCA |
| +054+ | 3.39 | Gene Nelson | 70.7 | OAK |
| +058+ | 3.34 | Edwin Nunez | 78 | DET |
| +063+ | 3.2 | Lee Smith | 82 | TOT |
| +065+ | 3.17 | Tom Henke | 70.7 | TOR |
| +067+ | 3.15 | Tim Crews | 102.3 | LAN |
| +069+ | 3.04 | Brad Arnsberg | 59.3 | TEX |
| +078+ | 2.72 | Jay Howell | 65 | LAN |
| +079+ | 2.67 | Doug Jones | 82 | CLE |
| +084+ | 2.52 | Dan Schatzeder | 67.7 | TOT |
| +087+ | 2.48 | Gregg Olson | 71.7 | BAL |
| +088+ | 2.47 | Craig Lefferts | 77.3 | SDN |
| +092+ | 2.4 | Barry Jones | 71 | CHA |
| +095+ | 2.32 | John Franco | 65 | NYN |
| +100+ | 2.2 | Bill Landrum | 66.3 | PIT |
| +107+ | 2.09 | Paul Assenmacher | 97.7 | CHN |
| +110+ | 2.06 | Eric Plunk | 71.7 | NYA |
| +114+ | 2.03 | Tim Burke | 70.3 | WAS |
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