| Team | Tm | Tier | Game |
|---|---|---|---|
| Oakland Athletics | OAK | 5.61 | 199009130_MIN_OAK |
| Detroit Tigers | DET | 2.35 | 199009150_NYA_DET |
| Pittsburgh Pirates | PIT | 1.43 | 199009140_PIT_WAS |
| Los Angeles Dodgers | LAN | 1.11 | 199009150_LAN_CIN |
| St. Louis Cardinals | SLN | 0.81 | 199009140_CHN_SLN |
| Team | Tm | Tier | Game |
|---|---|---|---|
| Chicago Cubs | CHN | -8.44 | 199009130_PHI_CHN |
| New York Yankees | NYA | -3.32 | 199009130_NYA_DET |
| Minnesota Twins | MIN | -2.23 | 199009150_MIN_OAK |
| Atlanta Braves | ATL | -1.67 | 199009140_SDN_ATL |
| Boston Red Sox | BOS | -1.05 | 199009130_BOS_CHA |
Based on accumulated WAA for this season up to 1990-09-15.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +020+ | 5.19 | John Tudor | 146.3 | SLN |
| +023+ | 4.77 | Dennis Eckersley | 65 | OAK |
| +025+ | 4.73 | Bill Swift | 120 | SEA |
| +034+ | 4.24 | Larry Andersen | 84.3 | TOT |
| +035+ | 4.08 | Rob Dibble | 88 | CIN |
| +038+ | 3.97 | Steve Farr | 105.7 | KCA |
| +044+ | 3.75 | Edwin Nunez | 78 | DET |
| +048+ | 3.59 | Bobby Thigpen | 79.7 | CHA |
| +051+ | 3.43 | Randy Myers | 78.3 | CIN |
| +057+ | 3.15 | Greg Harris | 106.7 | SDN |
| +059+ | 3.1 | Tim Crews | 92.3 | LAN |
| +060+ | 3.09 | Gene Nelson | 67.3 | OAK |
| +061+ | 3.05 | Jeff Montgomery | 84 | KCA |
| +065+ | 2.98 | Lee Smith | 79.7 | TOT |
| +069+ | 2.82 | Brad Arnsberg | 57 | TEX |
| +076+ | 2.61 | Jay Howell | 59 | LAN |
| +083+ | 2.43 | Bryan Harvey | 60 | ANA |
| +091+ | 2.37 | John Franco | 63.3 | NYN |
| +092+ | 2.36 | Gregg Olson | 68 | BAL |
| +097+ | 2.28 | Dave Smith | 58 | HOU |
| +098+ | 2.27 | Craig Lefferts | 75.3 | SDN |
| +099+ | 2.26 | Dan Schatzeder | 64.7 | TOT |
| +104+ | 2.21 | Barry Jones | 69 | CHA |
| +112+ | 2.05 | Eric Plunk | 64.7 | NYA |
| +113+ | 2.05 | Doug Jones | 72.7 | CLE |
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