| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jorge Lopez | BAL | -7.18 | 202104160_BAL_TEX |
| Trevor Williams | CHN | -4.01 | 202104170_ATL_CHN |
| Jeff Hoffman | CIN | -2.92 | 202104160_CLE_CIN |
| Trevor Cahill | PIT | -2.24 | 202104170_PIT_MIL |
| Yusei Kikuchi | SEA | -2.05 | 202104160_HOU_SEA |
Based on accumulated WAA for this season up to 2021-04-18.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +003+ | 1.82 | Tyler Glasnow | 24.7 | TBA |
| +005+ | 1.64 | Jacob deGrom | 20 | NYN |
| +006+ | 1.51 | Joe Musgrove | 19 | SDN |
| +008+ | 1.46 | Corbin Burnes | 18.3 | MIL |
| +007+ | 1.46 | Marcus Stroman | 20.3 | NYN |
| +009+ | 1.41 | John Means | 23.7 | BAL |
| +010+ | 1.35 | Lance Lynn | 19.7 | CHA |
| +012+ | 1.28 | Matt Boyd | 26.7 | DET |
| +013+ | 1.28 | Michael Pineda | 18 | MIN |
| +014+ | 1.26 | Carlos Rodon | 14 | CHA |
| XXXXX | 1.21 | Gerrit Cole | 24.7 | NYA |
| XXXXX | 1.18 | Dane Dunning | 15 | TEX |
| XXXXX | 1.16 | Anthony DeSclafani | 17 | SFN |
| XXXXX | 1.13 | Steven Matz | 18.3 | TOR |
| XXXXX | 1.12 | Aaron Nola | 24.7 | PHI |
| XXXXX | 1.08 | Joe Ross | 11 | WAS |
| XXXXX | 1.08 | Shane Bieber | 29.3 | CLE |
| XXXXX | 1.01 | Johnny Cueto | 20 | SFN |
| XXXXX | 0.98 | Hyun Jin Ryu | 19 | TOR |
| XXXXX | 0.98 | Clayton Kershaw | 24.7 | LAN |
| XXXXX | 0.95 | Taylor Widener | 17 | ARI |
| XXXXX | 0.94 | Danny Duffy | 12 | KCA |
| XXXXX | 0.89 | Aaron Civale | 20.7 | CLE |
| XXXXX | 0.89 | Trevor Bauer | 26 | LAN |
| XXXXX | 0.83 | JT Brubaker | 15.3 | PIT |
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