| Team | Tm | Tier | Game |
|---|---|---|---|
| Oakland Athletics | OAK | 3.87 | 199009070_OAK_NYA |
| Kansas City Royals | KCA | 1.52 | 199009050_KCA_CHA |
| Chicago White Sox | CHA | 1.34 | 199009070_CHA_TOR |
| St. Louis Cardinals | SLN | 1.27 | 199009070_SLN_CHN |
| Los Angeles Dodgers | LAN | 0.99 | 199009060_ATL_LAN |
| Team | Tm | Tier | Game |
|---|---|---|---|
| Atlanta Braves | ATL | -5.11 | 199009060_ATL_LAN |
| Chicago Cubs | CHN | -3.49 | 199009050_CHN_PHI |
| Baltimore Orioles | BAL | -2.96 | 199009050_SEA_BAL |
| Boston Red Sox | BOS | -1.65 | 199009070_SEA_BOS |
| Houston Astros | HOU | -1.08 | 199009070_HOU_SFN |
Based on accumulated WAA for this season up to 1990-09-07.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +017+ | 4.94 | Bill Swift | 115.7 | SEA |
| +021+ | 4.65 | Jeff Brantley | 86.7 | SFN |
| +022+ | 4.62 | John Tudor | 140.3 | SLN |
| +030+ | 4.35 | Dennis Eckersley | 60.3 | OAK |
| +035+ | 3.89 | Larry Andersen | 80.3 | TOT |
| +036+ | 3.88 | Steve Farr | 102.3 | KCA |
| +038+ | 3.77 | Rob Dibble | 84.3 | CIN |
| +044+ | 3.58 | Edwin Nunez | 69.3 | DET |
| +045+ | 3.48 | Gene Nelson | 64.7 | OAK |
| +051+ | 3.26 | Lee Smith | 78.3 | TOT |
| +053+ | 3.15 | Bobby Thigpen | 75 | CHA |
| +055+ | 3.12 | Tim Crews | 88 | LAN |
| +059+ | 3.04 | Tom Henke | 64.3 | TOR |
| +061+ | 2.97 | Randy Myers | 73 | CIN |
| +064+ | 2.88 | Greg Harris | 98.7 | SDN |
| +066+ | 2.87 | Jeff Montgomery | 82 | KCA |
| +071+ | 2.63 | Gregg Olson | 64 | BAL |
| +074+ | 2.56 | Brad Arnsberg | 54 | TEX |
| +079+ | 2.43 | Barry Jones | 67 | CHA |
| +080+ | 2.42 | Jay Howell | 57 | LAN |
| +082+ | 2.4 | John Franco | 59 | NYN |
| +085+ | 2.36 | Dan Schatzeder | 63.3 | HOU |
| +089+ | 2.28 | Craig Lefferts | 73 | SDN |
| +095+ | 2.12 | Dave Smith | 56 | HOU |
| +093+ | 2.12 | Bryan Harvey | 56.7 | ANA |
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