| Team | Tm | Tier | Game |
|---|---|---|---|
| Oakland Athletics | OAK | 6.16 | 199009210_DET_OAK |
| Detroit Tigers | DET | 1.37 | 199009210_DET_OAK |
| Cincinnati Reds | CIN | 1.22 | 199009230_CIN_SDN |
| Pittsburgh Pirates | PIT | 1.06 | 199009210_SLN_PIT |
| Chicago White Sox | CHA | 0.98 | 199009230_CHA_SEA |
| Team | Tm | Tier | Game |
|---|---|---|---|
| Atlanta Braves | ATL | -6.63 | 199009220_HOU_ATL |
| Chicago Cubs | CHN | -2.94 | 199009230_NYN_CHN |
| Houston Astros | HOU | -2.01 | 199009230_HOU_ATL |
| San Francisco Giants | SFN | -0.65 | 199009230_SFN_LAN |
| Minnesota Twins | MIN | -0.57 | 199009210_TEX_MIN |
Based on accumulated WAA for this season up to 1990-09-23.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +023+ | 5.19 | Dennis Eckersley | 69.7 | OAK |
| +026+ | 5.03 | Bill Swift | 123.3 | SEA |
| +030+ | 4.8 | Larry Andersen | 90.3 | TOT |
| +039+ | 4.36 | Rob Dibble | 93.3 | CIN |
| +047+ | 3.68 | Greg Harris | 112.3 | SDN |
| +048+ | 3.67 | Bobby Thigpen | 82.7 | CHA |
| +052+ | 3.44 | Randy Myers | 83 | CIN |
| +055+ | 3.39 | Gene Nelson | 70.7 | OAK |
| +056+ | 3.38 | Jeff Montgomery | 90 | KCA |
| +057+ | 3.34 | Edwin Nunez | 78 | DET |
| +059+ | 3.33 | Tim Crews | 99.3 | LAN |
| +062+ | 3.2 | Lee Smith | 82 | TOT |
| +070+ | 3.05 | Brad Arnsberg | 59.3 | TEX |
| +068+ | 3.05 | Tom Henke | 69.3 | TOR |
| +082+ | 2.58 | Doug Jones | 81 | CLE |
| +084+ | 2.53 | Dan Schatzeder | 67.7 | TOT |
| +086+ | 2.47 | Jay Howell | 62 | LAN |
| +087+ | 2.46 | Craig Lefferts | 77.3 | SDN |
| +090+ | 2.41 | Barry Jones | 71 | CHA |
| +094+ | 2.39 | Gregg Olson | 70.7 | BAL |
| +100+ | 2.32 | John Franco | 65 | NYN |
| +104+ | 2.21 | Bill Landrum | 66.3 | PIT |
| +108+ | 2.07 | Eric Plunk | 71.7 | NYA |
| +115+ | 1.96 | Tim Burke | 69.7 | WAS |
| +117+ | 1.95 | Paul Gibson | 97.3 | DET |
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