| Starter | Tm | Tier | Game |
|---|---|---|---|
| Rick Porcello | DET | -4.99 | 201305120_CLE_DET |
| Ubaldo Jimenez | CLE | -4.97 | 201305110_CLE_DET |
| Edinson Volquez | SDN | -2.41 | 201305100_SDN_TBA |
| Francisco Liriano | PIT | -2.4 | 201305110_PIT_NYN |
| Jordan Lyles | HOU | -2.16 | 201305120_TEX_HOU |
Based on accumulated WAA for this season up to 2013-05-12.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 3.32 | Felix Hernandez | 58.7 | SEA |
| +003+ | 3.21 | Matt Harvey | 56.3 | NYN |
| +004+ | 3.11 | Clay Buchholz | 58.7 | BOS |
| +005+ | 3.09 | Clayton Kershaw | 55.7 | LAN |
| +006+ | 2.85 | Jordan Zimmermann | 51 | WAS |
| +009+ | 2.68 | Hisashi Iwakuma | 51.7 | SEA |
| +010+ | 2.5 | Shelby Miller | 45.7 | SLN |
| +013+ | 2.23 | Adam Wainwright | 58.7 | SLN |
| +012+ | 2.23 | Justin Verlander | 51.3 | DET |
| +014+ | 2.22 | Patrick Corbin | 46.3 | ARI |
| +015+ | 2.14 | Madison Bumgarner | 53.7 | SFN |
| +016+ | 2.1 | Jake Westbrook | 39 | SLN |
| +022+ | 1.98 | Kyle Kendrick | 54.7 | PHI |
| +020+ | 1.98 | James Shields | 58 | KCA |
| +024+ | 1.94 | Anibal Sanchez | 45.7 | DET |
| +025+ | 1.92 | Hiroki Kuroda | 50.7 | NYA |
| +028+ | 1.84 | Jeremy Guthrie | 47.3 | KCA |
| +029+ | 1.83 | Matt Moore | 42 | TBA |
| +032+ | 1.77 | Travis Wood | 46.3 | CHN |
| +033+ | 1.69 | Derek Holland | 49.7 | TEX |
| +035+ | 1.66 | A.J. Burnett | 49 | PIT |
| +036+ | 1.63 | Kevin Slowey | 49.3 | MIA |
| +039+ | 1.55 | Yu Darvish | 52.7 | TEX |
| +040+ | 1.54 | Cliff Lee | 56.7 | PHI |
| +043+ | 1.5 | Jon Lester | 52.7 | BOS |
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