| Team | Tm | Tier | Game |
|---|---|---|---|
| Oakland Athletics | OAK | 5.27 | 199009030_OAK_BOS |
| Kansas City Royals | KCA | 1.59 | 199009030_KCA_CHA |
| Chicago White Sox | CHA | 1.43 | 199009040_KCA_CHA |
| Detroit Tigers | DET | 1.33 | 199009030_TOR_DET |
| Los Angeles Dodgers | LAN | 0.98 | 199009050_ATL_LAN |
| Team | Tm | Tier | Game |
|---|---|---|---|
| Atlanta Braves | ATL | -7.89 | 199009030_CIN_ATL |
| Chicago Cubs | CHN | -4.18 | 199009030_CHN_WAS |
| Baltimore Orioles | BAL | -3.17 | 199009040_SEA_BAL |
| Boston Red Sox | BOS | -1.6 | 199009050_OAK_BOS |
| Minnesota Twins | MIN | -1.04 | 199009040_MIN_MIL |
Based on accumulated WAA for this season up to 1990-09-05.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +018+ | 4.77 | Bill Swift | 113.3 | SEA |
| +019+ | 4.67 | Jeff Brantley | 86.7 | SFN |
| +029+ | 4.37 | Dennis Eckersley | 60.3 | OAK |
| +035+ | 3.89 | Steve Farr | 100 | KCA |
| +037+ | 3.77 | Rob Dibble | 84.3 | CIN |
| +043+ | 3.64 | Larry Andersen | 77.3 | TOT |
| +044+ | 3.57 | Edwin Nunez | 69.3 | DET |
| +045+ | 3.49 | Gene Nelson | 64.7 | OAK |
| +052+ | 3.16 | Bobby Thigpen | 75 | CHA |
| +054+ | 3.14 | Tim Crews | 88 | LAN |
| +055+ | 3.07 | Lee Smith | 76 | TOT |
| +059+ | 2.97 | Randy Myers | 73 | CIN |
| +060+ | 2.96 | Tom Henke | 63.3 | TOR |
| +067+ | 2.73 | Greg Harris | 96.7 | SDN |
| +068+ | 2.69 | Jeff Montgomery | 80 | KCA |
| +074+ | 2.48 | Brad Arnsberg | 53 | TEX |
| +076+ | 2.44 | Barry Jones | 67 | CHA |
| +077+ | 2.4 | John Franco | 59 | NYN |
| +080+ | 2.34 | Jay Howell | 56 | LAN |
| +083+ | 2.3 | Craig Lefferts | 73 | SDN |
| +085+ | 2.25 | Dan Schatzeder | 62 | HOU |
| +096+ | 2.07 | Dave Smith | 55.3 | HOU |
| +102+ | 2.05 | Bryan Harvey | 55.7 | ANA |
| +105+ | 2.03 | Lee Guetterman | 80.3 | NYA |
| +107+ | 2.01 | Bill Landrum | 64.3 | PIT |
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