| Team | Tm | Tier | Game |
|---|---|---|---|
| Oakland Athletics | OAK | 6.08 | 199009100_OAK_SEA |
| Pittsburgh Pirates | PIT | 1.44 | 199009120_PIT_NYN |
| St. Louis Cardinals | SLN | 1.39 | 199009100_SLN_NYN |
| Chicago White Sox | CHA | 1.1 | 199009110_CHA_CLE |
| Los Angeles Dodgers | LAN | 1.04 | 199009100_LAN_SDN |
| Team | Tm | Tier | Game |
|---|---|---|---|
| Chicago Cubs | CHN | -11.9 | 199009110_WAS_CHN |
| New York Yankees | NYA | -4.21 | 199009120_TEX_NYA |
| Atlanta Braves | ATL | -3.9 | 199009100_ATL_SFN |
| Baltimore Orioles | BAL | -1.46 | 199009100_DET_BAL |
| Minnesota Twins | MIN | -1.46 | 199009120_MIN_ANA |
Based on accumulated WAA for this season up to 1990-09-12.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +019+ | 5.13 | Bill Swift | 117.7 | SEA |
| +021+ | 5.02 | John Tudor | 144.3 | SLN |
| +026+ | 4.6 | Dennis Eckersley | 63 | OAK |
| +035+ | 4.06 | Larry Andersen | 82.3 | TOT |
| +036+ | 3.99 | Rob Dibble | 87 | CIN |
| +038+ | 3.96 | Edwin Nunez | 73.3 | DET |
| +042+ | 3.89 | Steve Farr | 104.7 | KCA |
| +049+ | 3.43 | Gene Nelson | 66.3 | OAK |
| +048+ | 3.43 | Randy Myers | 78.3 | CIN |
| +050+ | 3.41 | Bobby Thigpen | 77.7 | CHA |
| +056+ | 3.16 | Greg Harris | 104.3 | SDN |
| +058+ | 3.13 | Tom Henke | 65.3 | TOR |
| +060+ | 3.11 | Tim Crews | 92.3 | LAN |
| +064+ | 2.96 | Jeff Montgomery | 83 | KCA |
| +065+ | 2.88 | Lee Smith | 78.7 | TOT |
| +070+ | 2.77 | Gregg Olson | 65.7 | BAL |
| +071+ | 2.77 | Brad Arnsberg | 56.3 | TEX |
| +076+ | 2.61 | Jay Howell | 59 | LAN |
| +092+ | 2.34 | Bryan Harvey | 59 | ANA |
| +093+ | 2.33 | Craig Lefferts | 73.7 | SDN |
| +096+ | 2.29 | Dave Smith | 58 | HOU |
| +101+ | 2.2 | Dan Schatzeder | 64 | HOU |
| +103+ | 2.16 | John Franco | 61 | NYN |
| +106+ | 2.12 | Barry Jones | 68 | CHA |
| +112+ | 2.03 | Bill Landrum | 64.7 | PIT |
_