| Team | Tm | Tier | Game |
|---|---|---|---|
| Oakland Athletics | OAK | 4.3 | 199005290_TOR_OAK |
| New York Mets | NYN | 2.27 | 199005290_NYN_CIN |
| Kansas City Royals | KCA | 2.04 | 199005310_OAK_KCA |
| Cincinnati Reds | CIN | 2.02 | 199005290_NYN_CIN |
| New York Yankees | NYA | 1.57 | 199005290_NYA_CHA |
| Team | Tm | Tier | Game |
|---|---|---|---|
| Atlanta Braves | ATL | -3.3 | 199005300_WAS_ATL |
| California Angels | ANA | -2.1 | 199005290_CLE_ANA |
| Montreal Expos | WAS | -1.95 | 199005300_WAS_ATL |
| Chicago Cubs | CHN | -1.82 | 199005300_SFN_CHN |
| Texas Rangers | TEX | -1.65 | 199005290_BOS_TEX |
Based on accumulated WAA for this season up to 1990-05-31.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +015+ | 2.36 | Juan Agosto | 33.7 | HOU |
| +018+ | 2.24 | Gregg Olson | 27.3 | BAL |
| +019+ | 2.22 | Mark Eichhorn | 37 | ANA |
| +025+ | 2.12 | Jeff Brantley | 35.3 | SFN |
| +029+ | 1.91 | Doug Jones | 27.7 | CLE |
| +031+ | 1.9 | Greg Harris | 37 | SDN |
| +038+ | 1.74 | Danny Darwin | 29 | HOU |
| +037+ | 1.74 | Jim Acker | 35.7 | TOR |
| +039+ | 1.7 | Dennis Eckersley | 21.7 | OAK |
| +042+ | 1.66 | Bill Landrum | 25.3 | PIT |
| +046+ | 1.63 | Paul Assenmacher | 37 | CHN |
| +052+ | 1.55 | Mark Williamson | 29 | BAL |
| +055+ | 1.53 | Larry Andersen | 29 | HOU |
| +059+ | 1.45 | Rob Dibble | 26 | CIN |
| +061+ | 1.38 | Mike Schooler | 24.7 | SEA |
| +065+ | 1.37 | Jeff Montgomery | 36.3 | KCA |
| +066+ | 1.36 | Wayne Edwards | 24.7 | CHA |
| +071+ | 1.33 | Lee Smith | 31 | TOT |
| +075+ | 1.29 | Terry Leach | 30.3 | MIN |
| XXXXX | 1.25 | Barry Jones | 23.3 | CHA |
| XXXXX | 1.2 | Craig Lefferts | 22.3 | SDN |
| XXXXX | 1.2 | Dennis Lamp | 36.3 | BOS |
| XXXXX | 1.16 | Paul Gibson | 33.7 | DET |
| XXXXX | 1.15 | Ken Patterson | 24.7 | CHA |
| XXXXX | 1.14 | Wally Whitehurst | 19.7 | NYN |
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