| Team | Tm | Tier | Game |
|---|---|---|---|
| Oakland Athletics | OAK | 4.22 | 199006010_OAK_KCA |
| Kansas City Royals | KCA | 2.16 | 199006010_OAK_KCA |
| Cincinnati Reds | CIN | 1.74 | 199005310_CIN_LAN |
| Chicago White Sox | CHA | 1.41 | 199006010_MIN_CHA |
| Toronto Blue Jays | TOR | 1.14 | 199005300_TOR_OAK |
| Team | Tm | Tier | Game |
|---|---|---|---|
| Atlanta Braves | ATL | -3.3 | 199005300_WAS_ATL |
| Montreal Expos | WAS | -1.95 | 199005300_WAS_ATL |
| California Angels | ANA | -1.84 | 199005300_CLE_ANA |
| Chicago Cubs | CHN | -1.82 | 199005300_SFN_CHN |
| Texas Rangers | TEX | -1.61 | 199005300_BOS_TEX |
Based on accumulated WAA for this season up to 1990-06-01.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +015+ | 2.41 | Mark Eichhorn | 39 | ANA |
| +019+ | 2.25 | Gregg Olson | 27.3 | BAL |
| +022+ | 2.17 | Juan Agosto | 34 | HOU |
| +026+ | 2.08 | Jeff Brantley | 37.3 | SFN |
| +030+ | 1.91 | Greg Harris | 37 | SDN |
| +038+ | 1.75 | Jim Acker | 35.7 | TOR |
| +039+ | 1.73 | Danny Darwin | 29 | HOU |
| +042+ | 1.67 | Bill Landrum | 25.3 | PIT |
| +043+ | 1.66 | Rob Dibble | 28.3 | CIN |
| +046+ | 1.64 | Paul Assenmacher | 37 | CHN |
| +049+ | 1.62 | Dennis Eckersley | 23 | OAK |
| +052+ | 1.59 | Doug Jones | 28.7 | CLE |
| +054+ | 1.56 | Mark Williamson | 29 | BAL |
| +062+ | 1.39 | Mike Schooler | 24.7 | SEA |
| +066+ | 1.37 | Jeff Montgomery | 36.3 | KCA |
| +070+ | 1.37 | Wayne Edwards | 24.7 | CHA |
| +069+ | 1.37 | Barry Jones | 24.7 | CHA |
| +067+ | 1.37 | Larry Andersen | 29.7 | HOU |
| +068+ | 1.37 | Lee Smith | 31.3 | TOT |
| +076+ | 1.29 | Craig Lefferts | 23.3 | SDN |
| +080+ | 1.25 | Gene Nelson | 26 | OAK |
| XXXXX | 1.24 | Bill Swift | 34.7 | SEA |
| XXXXX | 1.23 | Paul Gibson | 34.3 | DET |
| XXXXX | 1.2 | Dennis Lamp | 36.3 | BOS |
| XXXXX | 1.16 | Ken Patterson | 24.7 | CHA |
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