| Team | Tm | Tier | Game |
|---|---|---|---|
| Oakland Athletics | OAK | 4.32 | 199008210_OAK_CHA |
| Kansas City Royals | KCA | 1.25 | 199008200_MIN_KCA |
| Baltimore Orioles | BAL | 1.2 | 199008190_OAK_BAL |
| Pittsburgh Pirates | PIT | 1.01 | 199008200_HOU_PIT |
| Chicago White Sox | CHA | 0.73 | 199008200_OAK_CHA |
| Team | Tm | Tier | Game |
|---|---|---|---|
| Atlanta Braves | ATL | -9.69 | 199008200_ATL_SLN |
| Chicago Cubs | CHN | -2.91 | 199008190_ATL_CHN |
| Boston Red Sox | BOS | -2.56 | 199008190_ANA_BOS |
| Milwaukee Brewers | MIL | -1.95 | 199008200_CLE_MIL |
| Minnesota Twins | MIN | -1.33 | 199008210_MIN_KCA |
Based on accumulated WAA for this season up to 1990-08-21.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +021+ | 4.28 | Jeff Brantley | 79.7 | SFN |
| +025+ | 3.98 | Mark Williamson | 85.3 | BAL |
| +026+ | 3.93 | Doug Jones | 60.7 | CLE |
| +029+ | 3.88 | Dennis Eckersley | 52.3 | OAK |
| +030+ | 3.87 | Steve Farr | 90.3 | KCA |
| +034+ | 3.63 | Gregg Olson | 60.7 | BAL |
| +039+ | 3.26 | Randy Myers | 66.7 | CIN |
| +041+ | 3.22 | Gene Nelson | 59 | OAK |
| +043+ | 3.2 | Rob Dibble | 73 | CIN |
| +044+ | 3.19 | Greg Harris | 92.3 | SDN |
| +048+ | 3.09 | Edwin Nunez | 61.3 | DET |
| +049+ | 3.03 | Jeff Montgomery | 74.3 | KCA |
| +053+ | 2.94 | Brad Arnsberg | 46.3 | TEX |
| +056+ | 2.9 | Lee Smith | 73.7 | TOT |
| +059+ | 2.85 | Bobby Thigpen | 66.7 | CHA |
| +062+ | 2.76 | Larry Andersen | 67 | HOU |
| +063+ | 2.74 | Tom Henke | 58.3 | TOR |
| +069+ | 2.56 | John Franco | 55.7 | NYN |
| +077+ | 2.34 | Barry Jones | 63.3 | CHA |
| +084+ | 2.25 | Tim Crews | 77.3 | LAN |
| +088+ | 2.14 | Mike Schooler | 56 | SEA |
| +091+ | 2.09 | Bill Landrum | 60.3 | PIT |
| +092+ | 2.06 | Dan Schatzeder | 57 | HOU |
| +095+ | 2.01 | Craig Lefferts | 69.7 | SDN |
| +097+ | 2 | Darrel Akerfelds | 77.3 | PHI |
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