| Starter | Tm | Tier | Game |
|---|---|---|---|
| Frank Viola | NYN | 7.17 | 199005180_NYN_SDN |
| Ted Higuera | MIL | 3.97 | 199005160_ANA_MIL |
| Bryn Smith | SLN | 3.75 | 199005160_HOU_SLN |
| Greg Maddux | CHN | 3.32 | 199005160_CHN_ATL |
| Ed Whitson | SDN | 3.11 | 199005160_PHI_SDN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jack Morris | DET | -5.04 | 199005170_DET_TEX |
| Todd Stottlemyre | TOR | -2.22 | 199005160_SEA_TOR |
| Oil Can Boyd | WAS | -2.12 | 199005180_WAS_SFN |
| Bruce Ruffin | PHI | -1.81 | 199005180_PHI_LAN |
| Jim Abbott | ANA | -1.71 | 199005180_ANA_TOR |
Based on accumulated WAA for this season up to 1990-05-18.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 2.97 | Frank Viola | 59.7 | NYN |
| +004+ | 2.86 | Bud Black | 59 | CLE |
| +005+ | 2.78 | Dennis Cook | 49.3 | PHI |
| +006+ | 2.73 | Bob Welch | 58 | OAK |
| +013+ | 1.9 | Chuck Finley | 47.3 | ANA |
| +015+ | 1.81 | Jack Armstrong | 44.3 | CIN |
| +018+ | 1.75 | Chris Bosio | 54.3 | MIL |
| +019+ | 1.72 | Mark Gardner | 40.3 | WAS |
| +020+ | 1.71 | Ed Whitson | 54 | SDN |
| +022+ | 1.7 | Dave Stewart | 53.3 | OAK |
| +025+ | 1.62 | Dennis Martinez | 58 | WAS |
| +028+ | 1.57 | Doug Drabek | 45.7 | PIT |
| +030+ | 1.53 | Teddy Higuera | 40.3 | MIL |
| +034+ | 1.47 | Bryn Smith | 56.3 | SLN |
| +035+ | 1.47 | Mike Morgan | 50.7 | LAN |
| +038+ | 1.45 | Neal Heaton | 44.3 | PIT |
| +039+ | 1.41 | Bill Wegman | 20.3 | MIL |
| +042+ | 1.34 | Fernando Valenzuela | 47 | LAN |
| +044+ | 1.3 | Bob Walk | 40.3 | PIT |
| +046+ | 1.29 | Tom Glavine | 48.3 | ATL |
| +051+ | 1.25 | Tom Gordon | 35.3 | KCA |
| XXXXX | 1.2 | Kevin Tapani | 48.3 | MIN |
| XXXXX | 1.16 | Dan Petry | 38.7 | DET |
| XXXXX | 1.13 | Scott Sanderson | 42 | OAK |
| XXXXX | 1.1 | Eric King | 41 | CHA |
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