| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jeff Francis | COL | -6.12 | 201305090_NYA_COL |
| Joe Blanton | ANA | -3.11 | 201305080_ANA_HOU |
| Edinson Volquez | SDN | -2.41 | 201305100_SDN_TBA |
| Mike Pelfrey | MIN | -1.95 | 201305100_BAL_MIN |
| Ricky Nolasco | MIA | -1.87 | 201305080_MIA_SDN |
Based on accumulated WAA for this season up to 2013-05-10.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 3.32 | Felix Hernandez | 58.7 | SEA |
| +003+ | 3.08 | Clayton Kershaw | 55.7 | LAN |
| +004+ | 2.98 | Matt Harvey | 49.3 | NYN |
| +005+ | 2.84 | Jordan Zimmermann | 51 | WAS |
| +006+ | 2.78 | Clay Buchholz | 50.7 | BOS |
| +007+ | 2.67 | Hisashi Iwakuma | 51.7 | SEA |
| +008+ | 2.5 | Shelby Miller | 45.7 | SLN |
| +011+ | 2.42 | Justin Verlander | 46.3 | DET |
| +012+ | 2.22 | Patrick Corbin | 46.3 | ARI |
| +014+ | 2.21 | Kevin Slowey | 44.7 | MIA |
| +018+ | 2.1 | Jake Westbrook | 39 | SLN |
| +020+ | 1.94 | Anibal Sanchez | 45.7 | DET |
| +023+ | 1.84 | Jeremy Guthrie | 47.3 | KCA |
| +025+ | 1.83 | Matt Moore | 42 | TBA |
| +028+ | 1.76 | Travis Wood | 46.3 | CHN |
| +029+ | 1.76 | Kyle Kendrick | 47.7 | PHI |
| +030+ | 1.72 | Jaime Garcia | 44 | SLN |
| +031+ | 1.71 | Madison Bumgarner | 46.7 | SFN |
| +033+ | 1.69 | Derek Holland | 49.7 | TEX |
| +034+ | 1.68 | Mat Latos | 44.3 | CIN |
| +036+ | 1.66 | A.J. Burnett | 49 | PIT |
| +035+ | 1.66 | James Shields | 50 | KCA |
| +037+ | 1.63 | Hiroki Kuroda | 43 | NYA |
| +039+ | 1.56 | Ervin Santana | 42 | KCA |
| +043+ | 1.53 | Yu Darvish | 45.7 | TEX |
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