| Team | Tm | Tier | Game |
|---|---|---|---|
| Oakland Athletics | OAK | 8.47 | 199009290_OAK_TEX |
| Pittsburgh Pirates | PIT | 2.33 | 199010010_NYN_PIT |
| Chicago White Sox | CHA | 2.11 | 199009300_SEA_CHA |
| Montreal Expos | WAS | 1.31 | 199010010_SLN_WAS |
| Cincinnati Reds | CIN | 0.78 | 199010010_HOU_CIN |
| Team | Tm | Tier | Game |
|---|---|---|---|
| Atlanta Braves | ATL | -6.68 | 199009300_ATL_HOU |
| Houston Astros | HOU | -1.84 | 199010010_HOU_CIN |
| Philadelphia Phillies | PHI | -1.57 | 199009300_PHI_WAS |
| Boston Red Sox | BOS | -1.28 | 199010010_CHA_BOS |
| Toronto Blue Jays | TOR | -1.08 | 199009300_TOR_BOS |
Based on accumulated WAA for this season up to 1990-10-01.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +024+ | 5.41 | Dennis Eckersley | 72.3 | OAK |
| +030+ | 5.07 | Bill Swift | 126.3 | SEA |
| +034+ | 4.67 | Rob Dibble | 97 | CIN |
| +040+ | 4.23 | Larry Andersen | 94 | TOT |
| +042+ | 4.13 | Greg Harris | 117.3 | SDN |
| +043+ | 4 | Bobby Thigpen | 86.7 | CHA |
| +050+ | 3.66 | Gene Nelson | 74 | OAK |
| +055+ | 3.44 | Randy Myers | 85.7 | CIN |
| +057+ | 3.41 | Tim Crews | 105.3 | LAN |
| +059+ | 3.32 | Jeff Montgomery | 94.3 | KCA |
| +062+ | 3.27 | Lee Smith | 83 | TOT |
| +064+ | 3.21 | Edwin Nunez | 79.3 | DET |
| +074+ | 2.86 | Tom Henke | 72 | TOR |
| +078+ | 2.76 | Doug Jones | 83.3 | CLE |
| +088+ | 2.51 | Bill Landrum | 70 | PIT |
| +094+ | 2.47 | Paul Assenmacher | 102 | CHN |
| +097+ | 2.46 | Gregg Olson | 74 | BAL |
| +098+ | 2.44 | Barry Jones | 74 | CHA |
| +102+ | 2.36 | Brad Arnsberg | 61.3 | TEX |
| +111+ | 2.13 | Eric Plunk | 72.7 | NYA |
| +112+ | 2.12 | Tim Burke | 74 | WAS |
| +113+ | 2.11 | John Franco | 67.7 | NYN |
| +121+ | 2 | Steve Frey | 53.7 | WAS |
| +133+ | 1.87 | Bob Patterson | 93.3 | PIT |
| +134+ | 1.85 | Mike Henneman | 94.3 | DET |
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