| Starter | Tm | Tier | Game |
|---|---|---|---|
| Ubaldo Jimenez | CLE | -6.85 | 201304290_CLE_KCA |
| Philip Humber | HOU | -2.95 | 201304300_HOU_NYA |
| Edinson Volquez | SDN | -2.62 | 201304300_SDN_CHN |
| Mike Pelfrey | MIN | -1.99 | 201304290_MIN_DET |
| Ricky Nolasco | MIA | -1.72 | 201304280_CHN_MIA |
Based on accumulated WAA for this season up to 2013-04-30.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 2.43 | Clay Buchholz | 37.7 | BOS |
| +004+ | 2.23 | Madison Bumgarner | 40.7 | SFN |
| +005+ | 2.19 | Clayton Kershaw | 41.7 | LAN |
| +006+ | 2.17 | Matt Moore | 32 | TBA |
| +007+ | 2.17 | Matt Harvey | 40.3 | NYN |
| +009+ | 2.02 | Felix Hernandez | 42.7 | SEA |
| +010+ | 1.98 | Hisashi Iwakuma | 37.7 | SEA |
| +013+ | 1.93 | Adam Wainwright | 44.3 | SLN |
| +014+ | 1.93 | Anibal Sanchez | 33.7 | DET |
| +015+ | 1.89 | Jake Westbrook | 27.7 | SLN |
| +016+ | 1.82 | Mat Latos | 39.3 | CIN |
| +017+ | 1.8 | Justin Verlander | 39.3 | DET |
| +021+ | 1.66 | Jordan Zimmermann | 36 | WAS |
| +022+ | 1.65 | Ervin Santana | 36 | KCA |
| +028+ | 1.5 | Yu Darvish | 38.7 | TEX |
| +026+ | 1.5 | Kevin Correia | 36.3 | MIN |
| +027+ | 1.5 | Kevin Slowey | 37.7 | MIA |
| +036+ | 1.4 | Ross Detwiler | 31 | WAS |
| +035+ | 1.4 | Patrick Corbin | 33 | ARI |
| +037+ | 1.39 | Hiroki Kuroda | 36 | NYA |
| +038+ | 1.37 | Carlos Villanueva | 35.3 | CHN |
| +040+ | 1.32 | Shelby Miller | 30.7 | SLN |
| +043+ | 1.28 | Kyle Kendrick | 33.7 | PHI |
| +045+ | 1.27 | Travis Wood | 32 | CHN |
| XXXXX | 1.22 | Alex Cobb | 35.3 | TBA |
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