| Team | Tm | Tier | Game |
|---|---|---|---|
| Oakland Athletics | OAK | 8.11 | 199009280_OAK_TEX |
| Chicago White Sox | CHA | 1.84 | 199009280_SEA_CHA |
| New York Mets | NYN | 1.57 | 199009270_NYN_WAS |
| Detroit Tigers | DET | 1.33 | 199009280_MIN_DET |
| Cincinnati Reds | CIN | 0.96 | 199009280_SDN_CIN |
| Team | Tm | Tier | Game |
|---|---|---|---|
| Atlanta Braves | ATL | -4.67 | 199009260_ATL_CIN |
| Chicago Cubs | CHN | -3.31 | 199009260_CHN_PIT |
| Houston Astros | HOU | -1.51 | 199009280_ATL_HOU |
| Philadelphia Phillies | PHI | -1.31 | 199009280_PHI_WAS |
| Baltimore Orioles | BAL | -1.21 | 199009260_BAL_NYA |
Based on accumulated WAA for this season up to 1990-09-28.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +023+ | 5.36 | Dennis Eckersley | 71.7 | OAK |
| +028+ | 4.98 | Bill Swift | 125.3 | SEA |
| +033+ | 4.61 | Larry Andersen | 93.3 | TOT |
| +035+ | 4.59 | Rob Dibble | 96 | CIN |
| +045+ | 3.86 | Greg Harris | 114.3 | SDN |
| +047+ | 3.83 | Bobby Thigpen | 84.7 | CHA |
| +053+ | 3.56 | Gene Nelson | 72.7 | OAK |
| +057+ | 3.36 | Randy Myers | 84.7 | CIN |
| +060+ | 3.33 | Tim Crews | 104.3 | LAN |
| +061+ | 3.23 | Edwin Nunez | 79.3 | DET |
| +062+ | 3.22 | Jeff Montgomery | 93 | KCA |
| +064+ | 3.19 | Lee Smith | 82 | TOT |
| +075+ | 2.78 | Tom Henke | 71 | TOR |
| +077+ | 2.72 | Jay Howell | 65 | LAN |
| +078+ | 2.66 | Doug Jones | 82 | CLE |
| +085+ | 2.58 | Brad Arnsberg | 61.3 | TEX |
| +089+ | 2.52 | Bill Landrum | 70 | PIT |
| +091+ | 2.48 | Barry Jones | 72 | CHA |
| +093+ | 2.46 | Craig Lefferts | 77.3 | SDN |
| +096+ | 2.4 | John Franco | 66 | NYN |
| +099+ | 2.35 | Gregg Olson | 72.7 | BAL |
| +104+ | 2.14 | Eric Plunk | 72.7 | NYA |
| +105+ | 2.13 | Paul Assenmacher | 98 | CHN |
| +117+ | 2.02 | Tim Burke | 70.3 | WAS |
| +118+ | 2.01 | Steve Frey | 53.7 | WAS |
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