| Team | Tm | Tier | Game |
|---|---|---|---|
| Oakland Athletics | OAK | 4.22 | 199009010_TEX_OAK |
| Kansas City Royals | KCA | 1.68 | 199009010_KCA_SEA |
| Detroit Tigers | DET | 1.06 | 199009010_DET_MIN |
| Los Angeles Dodgers | LAN | 0.8 | 199009010_LAN_WAS |
| Pittsburgh Pirates | PIT | 0.78 | 199009010_PIT_HOU |
| Team | Tm | Tier | Game |
|---|---|---|---|
| Atlanta Braves | ATL | -7.73 | 199009010_SLN_ATL |
| Boston Red Sox | BOS | -4.85 | 199009010_NYA_BOS |
| Chicago Cubs | CHN | -4.1 | 199009010_CIN_CHN |
| Philadelphia Phillies | PHI | -1.65 | 199008300_LAN_PHI |
| Minnesota Twins | MIN | -0.5 | 199009010_DET_MIN |
Based on accumulated WAA for this season up to 1990-09-01.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +017+ | 4.62 | Bill Swift | 111.7 | SEA |
| +020+ | 4.52 | Jeff Brantley | 85 | SFN |
| +021+ | 4.41 | Steve Farr | 99 | KCA |
| +026+ | 4.19 | Dennis Eckersley | 58.3 | OAK |
| +037+ | 3.62 | Rob Dibble | 80.3 | CIN |
| +039+ | 3.54 | Edwin Nunez | 66.7 | DET |
| +043+ | 3.32 | Gene Nelson | 62.7 | OAK |
| +044+ | 3.31 | Larry Andersen | 73.7 | HOU |
| +050+ | 3.08 | Randy Myers | 72 | CIN |
| +053+ | 2.98 | Lee Smith | 75 | TOT |
| +056+ | 2.95 | Bobby Thigpen | 72.7 | CHA |
| +059+ | 2.91 | Jeff Montgomery | 78 | KCA |
| +063+ | 2.86 | Tom Henke | 62.3 | TOR |
| +065+ | 2.78 | Tim Crews | 84 | LAN |
| +069+ | 2.73 | Greg Harris | 96.7 | SDN |
| +071+ | 2.57 | John Franco | 58.7 | NYN |
| +072+ | 2.55 | Gregg Olson | 63 | BAL |
| +079+ | 2.33 | Brad Arnsberg | 51.3 | TEX |
| +080+ | 2.32 | Barry Jones | 65.7 | CHA |
| +086+ | 2.26 | Jay Howell | 55 | LAN |
| +089+ | 2.21 | Doug Jones | 65.3 | CLE |
| +092+ | 2.14 | Curt Schilling | 35.3 | BAL |
| +096+ | 2.12 | Craig Lefferts | 71 | SDN |
| +100+ | 2.12 | Terry Leach | 74 | MIN |
| +105+ | 2.07 | Dan Schatzeder | 60 | HOU |
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