| Team | Tm | Tier | Game |
|---|---|---|---|
| Oakland Athletics | OAK | 6.16 | 199009210_DET_OAK |
| Detroit Tigers | DET | 1.37 | 199009210_DET_OAK |
| Cincinnati Reds | CIN | 1.09 | 199009221_CIN_SDN |
| Pittsburgh Pirates | PIT | 1.06 | 199009210_SLN_PIT |
| Chicago White Sox | CHA | 0.91 | 199009210_CHA_SEA |
| Team | Tm | Tier | Game |
|---|---|---|---|
| Atlanta Braves | ATL | -6.63 | 199009220_HOU_ATL |
| Chicago Cubs | CHN | -3.62 | 199009200_PIT_CHN |
| Houston Astros | HOU | -1.99 | 199009220_HOU_ATL |
| San Francisco Giants | SFN | -0.61 | 199009220_SFN_LAN |
| Minnesota Twins | MIN | -0.57 | 199009210_TEX_MIN |
Based on accumulated WAA for this season up to 1990-09-22.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +023+ | 5.2 | Dennis Eckersley | 69.7 | OAK |
| +025+ | 5.05 | Bill Swift | 123.3 | SEA |
| +029+ | 4.8 | Larry Andersen | 90.3 | TOT |
| +037+ | 4.37 | Rob Dibble | 93.3 | CIN |
| +047+ | 3.69 | Greg Harris | 112.3 | SDN |
| +048+ | 3.59 | Bobby Thigpen | 81.7 | CHA |
| +050+ | 3.45 | Randy Myers | 83 | CIN |
| +055+ | 3.39 | Jeff Montgomery | 90 | KCA |
| +053+ | 3.39 | Gene Nelson | 70.7 | OAK |
| +056+ | 3.35 | Edwin Nunez | 78 | DET |
| +058+ | 3.34 | Tim Crews | 99.3 | LAN |
| +063+ | 3.21 | Lee Smith | 82 | TOT |
| +068+ | 3.07 | Tom Henke | 69.3 | TOR |
| +069+ | 3.05 | Brad Arnsberg | 59.3 | TEX |
| +081+ | 2.65 | Doug Jones | 79.3 | CLE |
| +084+ | 2.54 | Dan Schatzeder | 67.7 | TOT |
| +086+ | 2.47 | Jay Howell | 62 | LAN |
| +087+ | 2.47 | Craig Lefferts | 77.3 | SDN |
| +092+ | 2.42 | Barry Jones | 71 | CHA |
| +093+ | 2.4 | Gregg Olson | 70.7 | BAL |
| +096+ | 2.33 | John Franco | 65 | NYN |
| +105+ | 2.21 | Bill Landrum | 66.3 | PIT |
| +107+ | 2.2 | Eric Plunk | 70.7 | NYA |
| +114+ | 1.97 | Paul Gibson | 97.3 | DET |
| +124+ | 1.8 | Bob Patterson | 92 | PIT |
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