| Starter | Tm | Tier | Game |
|---|---|---|---|
| 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 |
| Dillon Gee | NYN | -2.79 | 201305300_NYN_NYA |
Based on accumulated WAA for this season up to 2013-05-30.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 4.45 | Clayton Kershaw | 80.3 | LAN |
| +005+ | 3.83 | Matt Harvey | 78 | NYN |
| +006+ | 3.47 | Patrick Corbin | 68.3 | ARI |
| +007+ | 3.23 | Cliff Lee | 80.7 | PHI |
| +009+ | 3.13 | Felix Hernandez | 83.3 | SEA |
| +010+ | 3.08 | Jordan Zimmermann | 79.7 | WAS |
| +015+ | 2.83 | Shelby Miller | 62.3 | SLN |
| +016+ | 2.78 | Adam Wainwright | 80 | SLN |
| +017+ | 2.76 | Hisashi Iwakuma | 72.7 | SEA |
| +020+ | 2.6 | Stephen Strasburg | 72.3 | WAS |
| +021+ | 2.58 | Mike Minor | 72.7 | ATL |
| +022+ | 2.56 | Jeff Locke | 64 | PIT |
| +024+ | 2.5 | Hiroki Kuroda | 67.7 | NYA |
| +028+ | 2.2 | A.J. Burnett | 76 | PIT |
| +032+ | 2.13 | Travis Wood | 72 | CHN |
| +033+ | 2.11 | Alex Cobb | 67.7 | TBA |
| +042+ | 1.99 | Jeff Samardzija | 72.7 | CHN |
| +045+ | 1.97 | James Shields | 79 | KCA |
| +046+ | 1.95 | Hyun-Jin Ryu | 71.7 | LAN |
| +050+ | 1.88 | Jeanmar Gomez | 43 | PIT |
| +052+ | 1.8 | Justin Masterson | 82 | CLE |
| +054+ | 1.79 | Anibal Sanchez | 71 | DET |
| +061+ | 1.7 | Scott Feldman | 60.7 | CHN |
| +060+ | 1.7 | Trevor Cahill | 72 | ARI |
| +063+ | 1.67 | Lance Lynn | 68 | SLN |
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