| Team | Tm | Tier | Game |
|---|---|---|---|
| Oakland Athletics | OAK | 6.49 | 199009240_OAK_KCA |
| Cincinnati Reds | CIN | 1.22 | 199009230_CIN_SDN |
| Detroit Tigers | DET | 1.05 | 199009220_DET_OAK |
| Pittsburgh Pirates | PIT | 1 | 199009220_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 | -3.54 | 199009240_NYN_CHN |
| Houston Astros | HOU | -2.01 | 199009230_HOU_ATL |
| San Francisco Giants | SFN | -0.89 | 199009240_SDN_SFN |
| Minnesota Twins | MIN | -0.54 | 199009220_TEX_MIN |
Based on accumulated WAA for this season up to 1990-09-24.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +023+ | 5.19 | Dennis Eckersley | 69.7 | OAK |
| +025+ | 5.04 | Bill Swift | 123.3 | SEA |
| +030+ | 4.79 | Larry Andersen | 90.3 | TOT |
| +039+ | 4.37 | Rob Dibble | 93.3 | CIN |
| +048+ | 3.69 | Greg Harris | 112.3 | SDN |
| +049+ | 3.67 | Bobby Thigpen | 82.7 | CHA |
| +051+ | 3.47 | Jeff Montgomery | 91 | KCA |
| +052+ | 3.44 | Randy Myers | 83 | CIN |
| +054+ | 3.39 | Gene Nelson | 70.7 | OAK |
| +057+ | 3.34 | Edwin Nunez | 78 | DET |
| +061+ | 3.21 | Lee Smith | 82 | TOT |
| +065+ | 3.17 | Tom Henke | 70.7 | TOR |
| +069+ | 3.05 | Brad Arnsberg | 59.3 | TEX |
| +070+ | 3.02 | Tim Crews | 100.7 | LAN |
| +083+ | 2.58 | Doug Jones | 81 | CLE |
| +085+ | 2.55 | Jay Howell | 63 | LAN |
| +086+ | 2.53 | Dan Schatzeder | 67.7 | TOT |
| +087+ | 2.48 | Gregg Olson | 71.7 | BAL |
| +088+ | 2.47 | Craig Lefferts | 77.3 | SDN |
| +094+ | 2.41 | Barry Jones | 71 | CHA |
| +097+ | 2.32 | John Franco | 65 | NYN |
| +103+ | 2.21 | Bill Landrum | 66.3 | PIT |
| +106+ | 2.09 | Paul Assenmacher | 97.7 | CHN |
| +108+ | 2.06 | Eric Plunk | 71.7 | NYA |
| +114+ | 1.97 | Tim Burke | 69.7 | WAS |
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