| Team | Tm | Tier | Game |
|---|---|---|---|
| Oakland Athletics | OAK | 6.07 | 199009110_OAK_SEA |
| Detroit Tigers | DET | 1.88 | 199009130_NYA_DET |
| Pittsburgh Pirates | PIT | 1.44 | 199009120_PIT_NYN |
| Chicago White Sox | CHA | 1.1 | 199009110_CHA_CLE |
| Cincinnati Reds | CIN | 1 | 199009120_HOU_CIN |
| Team | Tm | Tier | Game |
|---|---|---|---|
| Chicago Cubs | CHN | -11.9 | 199009110_WAS_CHN |
| New York Yankees | NYA | -4.21 | 199009120_TEX_NYA |
| Atlanta Braves | ATL | -3.31 | 199009110_ATL_SFN |
| Minnesota Twins | MIN | -1.51 | 199009130_MIN_OAK |
| Boston Red Sox | BOS | -1.05 | 199009130_BOS_CHA |
Based on accumulated WAA for this season up to 1990-09-13.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +018+ | 5.21 | John Tudor | 146.3 | SLN |
| +024+ | 4.69 | Dennis Eckersley | 64 | OAK |
| +027+ | 4.58 | Bill Swift | 118.3 | SEA |
| +034+ | 4.09 | Rob Dibble | 88 | CIN |
| +035+ | 4.07 | Larry Andersen | 82.3 | TOT |
| +041+ | 3.89 | Steve Farr | 104.7 | KCA |
| +044+ | 3.75 | Edwin Nunez | 75.7 | DET |
| +048+ | 3.43 | Randy Myers | 78.3 | CIN |
| +049+ | 3.42 | Bobby Thigpen | 77.7 | CHA |
| +054+ | 3.17 | Greg Harris | 104.3 | SDN |
| +056+ | 3.14 | Tom Henke | 65.3 | TOR |
| +059+ | 3.11 | Tim Crews | 92.3 | LAN |
| +061+ | 3.1 | Gene Nelson | 67.3 | OAK |
| +063+ | 2.98 | Lee Smith | 79.7 | TOT |
| +065+ | 2.96 | Jeff Montgomery | 83 | KCA |
| +066+ | 2.9 | Gregg Olson | 67 | BAL |
| +069+ | 2.77 | Brad Arnsberg | 56.3 | TEX |
| +076+ | 2.61 | Jay Howell | 59 | LAN |
| +091+ | 2.34 | Bryan Harvey | 59 | ANA |
| +092+ | 2.34 | Craig Lefferts | 73.7 | SDN |
| +096+ | 2.29 | John Franco | 62.3 | NYN |
| +095+ | 2.29 | Dave Smith | 58 | HOU |
| +100+ | 2.2 | Dan Schatzeder | 64 | HOU |
| +106+ | 2.13 | Barry Jones | 68 | CHA |
| +111+ | 2.04 | Bill Landrum | 64.7 | PIT |
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