| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jake Arrieta | SDN | -5.81 | 202109030_HOU_SDN |
| Jesus Luzardo | MIA | -3.52 | 202109030_PHI_MIA |
| Mitch Keller | PIT | -3.09 | 202109020_PIT_CHN |
| Chi Chi Gonzalez | COL | -2.9 | 202109020_ATL_COL |
| Mike Minor | KCA | -2.59 | 202109020_CLE_KCA |
Based on accumulated WAA for this season up to 2021-09-04.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 8.75 | Walker Buehler | 176 | LAN |
| +004+ | 6.72 | Brandon Woodruff | 157.3 | MIL |
| +006+ | 6.31 | Max Scherzer | 146 | TOT |
| +007+ | 6.19 | Corbin Burnes | 139 | MIL |
| +009+ | 5.92 | Kevin Gausman | 157 | SFN |
| +011+ | 5.81 | Robbie Ray | 159.3 | TOR |
| +013+ | 5.47 | Adam Wainwright | 176 | SLN |
| +014+ | 5.46 | Gerrit Cole | 155 | NYA |
| +017+ | 5.33 | Lance Lynn | 135.7 | CHA |
| +018+ | 5.24 | Zack Wheeler | 182.7 | PHI |
| +019+ | 5.2 | Carlos Rodon | 119.7 | CHA |
| +020+ | 5.15 | Marcus Stroman | 156.7 | NYN |
| +027+ | 4.8 | Ranger Suarez | 72 | PHI |
| +030+ | 4.6 | Trevor Rogers | 114.3 | MIA |
| +031+ | 4.59 | Joe Musgrove | 153.7 | SDN |
| +034+ | 4.25 | Freddy Peralta | 123.3 | MIL |
| +038+ | 4.19 | Wade Miley | 148.7 | CIN |
| +040+ | 4.13 | Logan Webb | 112.3 | SFN |
| +051+ | 3.71 | Julio Urias | 156.3 | LAN |
| +058+ | 3.56 | Sandy Alcantara | 171.7 | MIA |
| +061+ | 3.4 | Chris Bassitt | 151 | OAK |
| +064+ | 3.32 | Kyle Gibson | 155.3 | TOT |
| +066+ | 3.29 | Shohei Ohtani | 112 | ANA |
| +075+ | 3.09 | Cal Quantrill | 122.7 | CLE |
| +081+ | 2.99 | Lance McCullers | 132.3 | HOU |
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