| Team | Tm | Tier | Game |
|---|---|---|---|
| Oakland Athletics | OAK | 5.27 | 199009030_OAK_BOS |
| Kansas City Royals | KCA | 1.6 | 199009020_KCA_SEA |
| Chicago White Sox | CHA | 1.43 | 199009040_KCA_CHA |
| Detroit Tigers | DET | 1.33 | 199009030_TOR_DET |
| Los Angeles Dodgers | LAN | 0.97 | 199009040_HOU_LAN |
| Team | Tm | Tier | Game |
|---|---|---|---|
| Atlanta Braves | ATL | -8.44 | 199009020_SLN_ATL |
| Chicago Cubs | CHN | -4.47 | 199009020_CIN_CHN |
| Baltimore Orioles | BAL | -3.17 | 199009040_SEA_BAL |
| Boston Red Sox | BOS | -1.86 | 199009020_NYA_BOS |
| Minnesota Twins | MIN | -1.04 | 199009040_MIN_MIL |
Based on accumulated WAA for this season up to 1990-09-04.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +017+ | 4.72 | Bill Swift | 112.7 | SEA |
| +018+ | 4.68 | Jeff Brantley | 86.7 | SFN |
| +025+ | 4.43 | Steve Farr | 99 | KCA |
| +028+ | 4.37 | Dennis Eckersley | 60.3 | OAK |
| +036+ | 3.81 | Rob Dibble | 82.3 | CIN |
| +039+ | 3.65 | Larry Andersen | 77.3 | TOT |
| +040+ | 3.55 | Edwin Nunez | 66.7 | DET |
| +043+ | 3.5 | Gene Nelson | 64.7 | OAK |
| +050+ | 3.17 | Bobby Thigpen | 75 | CHA |
| +052+ | 3.15 | Tim Crews | 88 | LAN |
| +054+ | 3.07 | Lee Smith | 76 | TOT |
| +058+ | 2.98 | Randy Myers | 73 | CIN |
| +063+ | 2.88 | Tom Henke | 62.3 | TOR |
| +067+ | 2.74 | Greg Harris | 96.7 | SDN |
| +069+ | 2.69 | Jeff Montgomery | 80 | KCA |
| +072+ | 2.58 | John Franco | 58.7 | NYN |
| +074+ | 2.45 | Barry Jones | 67 | CHA |
| +077+ | 2.4 | Brad Arnsberg | 52 | TEX |
| +080+ | 2.35 | Jay Howell | 56 | LAN |
| +085+ | 2.26 | Dan Schatzeder | 62 | HOU |
| +088+ | 2.22 | Craig Lefferts | 72 | SDN |
| +091+ | 2.2 | Bryan Harvey | 55 | ANA |
| +093+ | 2.19 | Doug Jones | 67.3 | CLE |
| +103+ | 2.07 | Dave Smith | 55.3 | HOU |
| +108+ | 2.04 | Lee Guetterman | 80.3 | NYA |
_