| Team | Tm | Tier | Game |
|---|---|---|---|
| Oakland Athletics | OAK | 5.27 | 199009030_OAK_BOS |
| Kansas City Royals | KCA | 1.68 | 199009010_KCA_SEA |
| Detroit Tigers | DET | 1.33 | 199009030_TOR_DET |
| Los Angeles Dodgers | LAN | 0.92 | 199009030_HOU_LAN |
| Pittsburgh Pirates | PIT | 0.9 | 199009030_PHI_PIT |
| Team | Tm | Tier | Game |
|---|---|---|---|
| Atlanta Braves | ATL | -8.44 | 199009020_SLN_ATL |
| Boston Red Sox | BOS | -4.85 | 199009010_NYA_BOS |
| Chicago Cubs | CHN | -4.47 | 199009020_CIN_CHN |
| Baltimore Orioles | BAL | -0.65 | 199009030_SEA_BAL |
| Minnesota Twins | MIN | -0.57 | 199009020_DET_MIN |
Based on accumulated WAA for this season up to 1990-09-03.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +017+ | 4.72 | Bill Swift | 112.7 | SEA |
| +018+ | 4.68 | Jeff Brantley | 86.7 | SFN |
| +022+ | 4.42 | Steve Farr | 99 | KCA |
| +025+ | 4.28 | Dennis Eckersley | 59.3 | OAK |
| +040+ | 3.62 | Rob Dibble | 80.3 | CIN |
| +042+ | 3.55 | Edwin Nunez | 66.7 | DET |
| +043+ | 3.5 | Gene Nelson | 64.7 | OAK |
| +046+ | 3.4 | Larry Andersen | 74.7 | TOT |
| +052+ | 3.09 | Randy Myers | 72 | CIN |
| +053+ | 3.09 | Tim Crews | 87.3 | LAN |
| +056+ | 3.05 | Bobby Thigpen | 73.7 | CHA |
| +059+ | 2.98 | Lee Smith | 75 | TOT |
| +064+ | 2.87 | Tom Henke | 62.3 | TOR |
| +065+ | 2.8 | Jeff Montgomery | 79 | KCA |
| +067+ | 2.73 | Greg Harris | 96.7 | SDN |
| +071+ | 2.57 | John Franco | 58.7 | NYN |
| +072+ | 2.55 | Gregg Olson | 63 | BAL |
| +075+ | 2.45 | Barry Jones | 67 | CHA |
| +078+ | 2.39 | Brad Arnsberg | 52 | TEX |
| +081+ | 2.35 | Jay Howell | 56 | LAN |
| +085+ | 2.25 | Dan Schatzeder | 62 | HOU |
| +087+ | 2.22 | Craig Lefferts | 72 | SDN |
| +090+ | 2.21 | Doug Jones | 65.3 | CLE |
| +092+ | 2.2 | Bryan Harvey | 55 | ANA |
| +095+ | 2.15 | Curt Schilling | 35.3 | BAL |
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