| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jeff Francis | COL | -6.12 | 201305090_NYA_COL |
| Ubaldo Jimenez | CLE | -4.97 | 201305110_CLE_DET |
| Edinson Volquez | SDN | -2.41 | 201305100_SDN_TBA |
| Francisco Liriano | PIT | -2.4 | 201305110_PIT_NYN |
| Mike Pelfrey | MIN | -1.95 | 201305100_BAL_MIN |
Based on accumulated WAA for this season up to 2013-05-11.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 3.34 | Felix Hernandez | 58.7 | SEA |
| +003+ | 3.12 | Clay Buchholz | 58.7 | BOS |
| +004+ | 3.1 | Clayton Kershaw | 55.7 | LAN |
| +005+ | 3 | Matt Harvey | 49.3 | NYN |
| +006+ | 2.86 | Jordan Zimmermann | 51 | WAS |
| +007+ | 2.69 | Hisashi Iwakuma | 51.7 | SEA |
| +009+ | 2.51 | Shelby Miller | 45.7 | SLN |
| +011+ | 2.25 | Justin Verlander | 51.3 | DET |
| +013+ | 2.24 | Adam Wainwright | 58.7 | SLN |
| +012+ | 2.24 | Patrick Corbin | 46.3 | ARI |
| +014+ | 2.15 | Madison Bumgarner | 53.7 | SFN |
| +015+ | 2.11 | Jake Westbrook | 39 | SLN |
| +020+ | 2 | James Shields | 58 | KCA |
| +021+ | 1.96 | Anibal Sanchez | 45.7 | DET |
| +024+ | 1.85 | Jeremy Guthrie | 47.3 | KCA |
| +025+ | 1.84 | Matt Moore | 42 | TBA |
| +027+ | 1.78 | Travis Wood | 46.3 | CHN |
| +029+ | 1.77 | Kyle Kendrick | 47.7 | PHI |
| +033+ | 1.73 | Jaime Garcia | 44 | SLN |
| +034+ | 1.71 | Derek Holland | 49.7 | TEX |
| +036+ | 1.67 | A.J. Burnett | 49 | PIT |
| +037+ | 1.64 | Hiroki Kuroda | 43 | NYA |
| +038+ | 1.62 | Kevin Slowey | 49.3 | MIA |
| +043+ | 1.57 | Yu Darvish | 52.7 | TEX |
| +042+ | 1.57 | Ervin Santana | 42 | KCA |
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