| Starter | Tm | Tier | Game |
|---|---|---|---|
| Ubaldo Jimenez | CLE | -4.7 | 201305270_CLE_CIN |
| Joe Blanton | ANA | -4.65 | 201305280_ANA_LAN |
| Rick Porcello | DET | -4.33 | 201305280_PIT_DET |
| Roberto Hernandez | TBA | -3.13 | 201305290_TBA_MIA |
| Edinson Volquez | SDN | -3.11 | 201305280_SDN_SEA |
Based on accumulated WAA for this season up to 2013-05-29.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +003+ | 4.44 | Clayton Kershaw | 80.3 | LAN |
| +005+ | 3.83 | Matt Harvey | 78 | NYN |
| +006+ | 3.46 | Patrick Corbin | 68.3 | ARI |
| +008+ | 3.24 | Cliff Lee | 80.7 | PHI |
| +009+ | 3.08 | Jordan Zimmermann | 79.7 | WAS |
| +011+ | 2.83 | Shelby Miller | 62.3 | SLN |
| +013+ | 2.79 | Adam Wainwright | 80 | SLN |
| +014+ | 2.77 | Hisashi Iwakuma | 72.7 | SEA |
| +020+ | 2.6 | Stephen Strasburg | 72.3 | WAS |
| +019+ | 2.6 | Felix Hernandez | 75.3 | SEA |
| +021+ | 2.55 | Matt Moore | 61 | TBA |
| +022+ | 2.5 | Hiroki Kuroda | 67.7 | NYA |
| +025+ | 2.36 | Mike Minor | 65.7 | ATL |
| +027+ | 2.24 | A.J. Burnett | 76 | PIT |
| +030+ | 2.12 | Alex Cobb | 67.7 | TBA |
| +032+ | 2.09 | Jeff Locke | 58.7 | PIT |
| +036+ | 2 | Travis Wood | 66 | CHN |
| +037+ | 1.99 | Jeff Samardzija | 72.7 | CHN |
| +039+ | 1.98 | James Shields | 79 | KCA |
| +046+ | 1.94 | Hyun-Jin Ryu | 71.7 | LAN |
| +049+ | 1.9 | Jeanmar Gomez | 43 | PIT |
| +053+ | 1.81 | Anibal Sanchez | 71 | DET |
| +054+ | 1.81 | Justin Masterson | 82 | CLE |
| +060+ | 1.71 | Scott Feldman | 60.7 | CHN |
| +063+ | 1.69 | Trevor Cahill | 72 | ARI |
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