| Starter | Tm | Tier | Game |
|---|---|---|---|
| Frank Viola | NYN | 5.37 | 199006270_NYN_SLN |
| Dave Stieb | TOR | 4.66 | 199006250_TOR_BOS |
| Bob Welch | OAK | 3.87 | 199006250_DET_OAK |
| Tom Browning | CIN | 3.68 | 199006270_SFN_CIN |
| Chuck Finley | ANA | 3.65 | 199006270_CHA_ANA |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jack Morris | DET | -6.84 | 199006260_DET_OAK |
| Andy Hawkins | NYA | -4.77 | 199006260_MIL_NYA |
| Walt Terrell | PIT | -3.94 | 199006270_PHI_PIT |
| Jim Clancy | HOU | -3.03 | 199006260_SDN_HOU |
| John Smoltz | ATL | -1.36 | 199006270_LAN_ATL |
Based on accumulated WAA for this season up to 1990-06-27.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +004+ | 4.31 | Jack Armstrong | 102 | CIN |
| +010+ | 3.82 | Roger Clemens | 114.7 | BOS |
| +012+ | 3.65 | Eric King | 91 | CHA |
| +013+ | 3.61 | Bob Welch | 114 | OAK |
| +014+ | 3.6 | Frank Viola | 106.3 | NYN |
| +016+ | 3.57 | Dennis Martinez | 108 | WAS |
| +019+ | 3.19 | Ramon Martinez | 103 | LAN |
| +022+ | 3.06 | Mark Gardner | 84 | WAS |
| +024+ | 3.04 | Dave Stewart | 114.7 | OAK |
| +025+ | 2.95 | Chuck Finley | 99.7 | ANA |
| +028+ | 2.75 | Greg Hibbard | 90.3 | CHA |
| +029+ | 2.68 | Bret Saberhagen | 109 | KCA |
| +034+ | 2.51 | Kirk McCaskill | 69.3 | ANA |
| +036+ | 2.47 | John Tudor | 80 | SLN |
| +037+ | 2.45 | Tom Browning | 116.3 | CIN |
| +045+ | 2.26 | Kevin Brown | 111.7 | TEX |
| +048+ | 2.22 | Dave Stieb | 91.7 | TOR |
| +049+ | 2.2 | Ed Whitson | 100.3 | SDN |
| +050+ | 2.2 | Neal Heaton | 87.3 | PIT |
| +057+ | 1.97 | Doug Drabek | 91.7 | PIT |
| +064+ | 1.88 | Mark Langston | 106.3 | ANA |
| +072+ | 1.77 | Mike Boddicker | 110.7 | BOS |
| +073+ | 1.75 | Mike Morgan | 105.7 | LAN |
| +079+ | 1.63 | Charlie Leibrandt | 40 | ATL |
| +091+ | 1.46 | Tom Gordon | 82 | KCA |
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