| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bret Saberhagen | KCA | 8.65 | 198909221_SEA_KCA |
| Scott Garrelts | SFN | 4.73 | 198909220_HOU_SFN |
| Ed Whitson | SDN | 3.58 | 198909200_SDN_CIN |
| John Smiley | PIT | 3.27 | 198909210_WAS_PIT |
| Kirk McCaskill | ANA | 1.96 | 198909210_ANA_CLE |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Walt Terrell | NYA | -3.3 | 198909220_NYA_BAL |
| Bob Knepper | SFN | -3.21 | 198909200_LAN_SFN |
| Melido Perez | CHA | -3.08 | 198909200_CHA_KCA |
| Randy Johnson | SEA | -1.75 | 198909210_SEA_TEX |
| Jerry Reuss | MIL | -1.49 | 198909220_TOR_MIL |
Based on accumulated WAA for this season up to 1989-09-22.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 8.55 | Bret Saberhagen | 246 | KCA |
| +006+ | 6.9 | Orel Hershiser | 239 | LAN |
| +009+ | 6.23 | Mike Moore | 228.7 | OAK |
| +010+ | 6.01 | Scott Garrelts | 186.7 | SFN |
| +015+ | 5.59 | Ed Whitson | 220 | SDN |
| +017+ | 5.39 | Bert Blyleven | 225 | ANA |
| +020+ | 5.28 | Chuck Finley | 187.3 | ANA |
| +019+ | 5.28 | Bruce Hurst | 238.3 | SDN |
| +021+ | 5.19 | Mark Langston | 240.7 | TOT |
| +027+ | 4.78 | Chris Bosio | 235 | MIL |
| +030+ | 4.59 | Bryn Smith | 203.7 | WAS |
| +032+ | 4.44 | Rick Reuschel | 195.3 | SFN |
| +039+ | 4.16 | Kirk McCaskill | 198.7 | ANA |
| +040+ | 4.14 | Mark Gubicza | 255.7 | KCA |
| +041+ | 4.12 | Jose DeLeon | 233 | SLN |
| +045+ | 4 | Doug Drabek | 236.3 | PIT |
| +047+ | 3.94 | Mike Morgan | 152.3 | LAN |
| +048+ | 3.9 | John Smiley | 205.3 | PIT |
| +050+ | 3.87 | Joe Magrane | 227.7 | SLN |
| +052+ | 3.85 | Greg Maddux | 230 | CHN |
| +055+ | 3.72 | Tim Belcher | 221.3 | LAN |
| +058+ | 3.62 | John Cerutti | 198.7 | TOR |
| +063+ | 3.45 | Sid Fernandez | 202 | NYN |
| +065+ | 3.38 | Todd Burns | 92 | OAK |
| +075+ | 3.07 | Roger Clemens | 237.7 | BOS |
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