| Starter | Tm | Tier | Game |
|---|---|---|---|
| J.A. Happ | SLN | -6.13 | 202109070_LAN_SLN |
| Matt Harvey | BAL | -5.44 | 202109080_KCA_BAL |
| Jesus Luzardo | MIA | -3.74 | 202109090_NYN_MIA |
| Chi Chi Gonzalez | COL | -3.38 | 202109070_SFN_COL |
| Mike Minor | KCA | -2.32 | 202109080_KCA_BAL |
Based on accumulated WAA for this season up to 2021-09-09.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 7.83 | Walker Buehler | 179 | LAN |
| +003+ | 7.16 | Max Scherzer | 154 | TOT |
| +006+ | 6.47 | Brandon Woodruff | 163.3 | MIL |
| +007+ | 6.46 | Robbie Ray | 166 | TOR |
| +008+ | 6.05 | Corbin Burnes | 144 | MIL |
| +009+ | 5.98 | Kevin Gausman | 164 | SFN |
| +010+ | 5.84 | Zack Wheeler | 188.7 | PHI |
| +012+ | 5.69 | Marcus Stroman | 163 | NYN |
| +015+ | 5.45 | Adam Wainwright | 184.3 | SLN |
| +016+ | 5.4 | Gerrit Cole | 158.7 | NYA |
| +017+ | 5.35 | Lance Lynn | 135.7 | CHA |
| +020+ | 5.23 | Carlos Rodon | 119.7 | CHA |
| +021+ | 5.19 | Ranger Suarez | 78 | PHI |
| +031+ | 4.67 | Wade Miley | 155.7 | CIN |
| +034+ | 4.59 | Joe Musgrove | 153.7 | SDN |
| +035+ | 4.58 | Trevor Rogers | 114.3 | MIA |
| +037+ | 4.4 | Freddy Peralta | 127 | MIL |
| +044+ | 4.21 | Sandy Alcantara | 180.7 | MIA |
| +046+ | 4.18 | Logan Webb | 119.3 | SFN |
| +061+ | 3.75 | Julio Urias | 156.3 | LAN |
| +062+ | 3.63 | Cal Quantrill | 130.3 | CLE |
| +068+ | 3.42 | Chris Bassitt | 151 | OAK |
| +072+ | 3.3 | Shohei Ohtani | 112 | ANA |
| +080+ | 3.16 | Lance McCullers | 138.3 | HOU |
| +081+ | 3.15 | Kyle Gibson | 160 | TOT |
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