| Team | Tm | Tier | Game |
|---|---|---|---|
| Oakland Athletics | OAK | 7 | 199009270_OAK_TEX |
| New York Mets | NYN | 1.57 | 199009270_NYN_WAS |
| Chicago White Sox | CHA | 1.2 | 199009270_MIL_CHA |
| Detroit Tigers | DET | 1.03 | 199009260_SEA_DET |
| Cincinnati Reds | CIN | 0.84 | 199009270_ATL_CIN |
| Team | Tm | Tier | Game |
|---|---|---|---|
| Atlanta Braves | ATL | -4.75 | 199009250_ATL_CIN |
| Chicago Cubs | CHN | -3.71 | 199009250_CHN_PIT |
| Houston Astros | HOU | -1.32 | 199009260_LAN_HOU |
| Baltimore Orioles | BAL | -1.21 | 199009260_BAL_NYA |
| Philadelphia Phillies | PHI | -1.17 | 199009270_SLN_PHI |
Based on accumulated WAA for this season up to 1990-09-27.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +024+ | 5.28 | Dennis Eckersley | 70.7 | OAK |
| +028+ | 4.99 | Bill Swift | 125.3 | SEA |
| +031+ | 4.77 | Larry Andersen | 92.7 | TOT |
| +036+ | 4.59 | Rob Dibble | 96 | CIN |
| +046+ | 3.87 | Greg Harris | 114.3 | SDN |
| +047+ | 3.84 | Bobby Thigpen | 84.7 | CHA |
| +052+ | 3.49 | Randy Myers | 83.7 | CIN |
| +053+ | 3.48 | Gene Nelson | 71.7 | OAK |
| +058+ | 3.24 | Edwin Nunez | 79.3 | DET |
| +061+ | 3.2 | Lee Smith | 82 | TOT |
| +062+ | 3.17 | Tom Henke | 70.7 | TOR |
| +065+ | 3.16 | Jeff Montgomery | 92.3 | KCA |
| +066+ | 3.15 | Tim Crews | 102.3 | LAN |
| +077+ | 2.72 | Jay Howell | 65 | LAN |
| +079+ | 2.67 | Doug Jones | 82 | CLE |
| +085+ | 2.59 | Brad Arnsberg | 61.3 | TEX |
| +088+ | 2.51 | Dan Schatzeder | 67.7 | TOT |
| +089+ | 2.49 | Barry Jones | 72 | CHA |
| +090+ | 2.47 | Craig Lefferts | 77.3 | SDN |
| +094+ | 2.4 | John Franco | 66 | NYN |
| +098+ | 2.36 | Gregg Olson | 72.7 | BAL |
| +102+ | 2.2 | Bill Landrum | 66.3 | PIT |
| +110+ | 2.13 | Paul Assenmacher | 98 | CHN |
| +114+ | 2.06 | Eric Plunk | 71.7 | NYA |
| +117+ | 2.02 | Tim Burke | 70.3 | WAS |
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