| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jake Arrieta | SDN | -5.81 | 202109030_HOU_SDN |
| Matt Harvey | BAL | -5.29 | 202109010_BAL_TOR |
| J.A. Happ | SLN | -4 | 202109012_SLN_CIN |
| Jesus Luzardo | MIA | -3.52 | 202109030_PHI_MIA |
| Mitch Keller | PIT | -3.09 | 202109020_PIT_CHN |
Based on accumulated WAA for this season up to 2021-09-03.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 8.72 | Walker Buehler | 176 | LAN |
| +004+ | 6.69 | Brandon Woodruff | 157.3 | MIL |
| +006+ | 6.35 | Max Scherzer | 146 | TOT |
| +007+ | 6.17 | Corbin Burnes | 139 | MIL |
| +009+ | 5.9 | Kevin Gausman | 157 | SFN |
| +010+ | 5.78 | Robbie Ray | 159.3 | TOR |
| +013+ | 5.43 | Gerrit Cole | 155 | NYA |
| +014+ | 5.42 | Adam Wainwright | 176 | SLN |
| +015+ | 5.33 | Marcus Stroman | 151.7 | NYN |
| +016+ | 5.31 | Lance Lynn | 135.7 | CHA |
| +018+ | 5.19 | Zack Wheeler | 182.7 | PHI |
| +019+ | 5.19 | Carlos Rodon | 119.7 | CHA |
| +030+ | 4.46 | Joe Musgrove | 148.3 | SDN |
| +031+ | 4.29 | Ranger Suarez | 67 | PHI |
| +034+ | 4.23 | Freddy Peralta | 123.3 | MIL |
| +036+ | 4.16 | Wade Miley | 148.7 | CIN |
| +041+ | 4.11 | Logan Webb | 112.3 | SFN |
| +055+ | 3.53 | Sandy Alcantara | 171.7 | MIA |
| +058+ | 3.36 | Chris Bassitt | 151 | OAK |
| +059+ | 3.34 | Julio Urias | 150.7 | LAN |
| +063+ | 3.29 | Kyle Gibson | 155.3 | TOT |
| +064+ | 3.28 | Shohei Ohtani | 112 | ANA |
| +077+ | 3.07 | Cal Quantrill | 122.7 | CLE |
| +081+ | 3.04 | Framber Valdez | 105 | HOU |
| +084+ | 2.96 | Lance McCullers | 132.3 | HOU |
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