| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jeff Francis | COL | -6.12 | 201305090_NYA_COL |
| Joe Blanton | ANA | -3.11 | 201305080_ANA_HOU |
| Roberto Hernandez | TBA | -2.23 | 201305070_TOR_TBA |
| Jordan Lyles | HOU | -1.94 | 201305070_ANA_HOU |
| J.A. Happ | TOR | -1.92 | 201305070_TOR_TBA |
Based on accumulated WAA for this season up to 2013-05-09.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 3.29 | Felix Hernandez | 58.7 | SEA |
| +003+ | 3.06 | Clayton Kershaw | 55.7 | LAN |
| +004+ | 2.96 | Matt Harvey | 49.3 | NYN |
| +005+ | 2.82 | Jordan Zimmermann | 51 | WAS |
| +006+ | 2.76 | Clay Buchholz | 50.7 | BOS |
| +008+ | 2.43 | Hisashi Iwakuma | 44.7 | SEA |
| +009+ | 2.39 | Justin Verlander | 46.3 | DET |
| +012+ | 2.2 | Patrick Corbin | 46.3 | ARI |
| +013+ | 2.19 | Kevin Slowey | 44.7 | MIA |
| +017+ | 2.08 | Jake Westbrook | 39 | SLN |
| +019+ | 1.92 | Anibal Sanchez | 45.7 | DET |
| +021+ | 1.82 | Jeremy Guthrie | 47.3 | KCA |
| +023+ | 1.81 | Matt Moore | 42 | TBA |
| +026+ | 1.73 | Travis Wood | 46.3 | CHN |
| +027+ | 1.73 | Kyle Kendrick | 47.7 | PHI |
| +028+ | 1.7 | Jaime Garcia | 44 | SLN |
| +029+ | 1.69 | Madison Bumgarner | 46.7 | SFN |
| +030+ | 1.67 | Derek Holland | 49.7 | TEX |
| +031+ | 1.66 | Shelby Miller | 36.7 | SLN |
| +032+ | 1.66 | Mat Latos | 44.3 | CIN |
| +034+ | 1.64 | A.J. Burnett | 49 | PIT |
| +035+ | 1.64 | James Shields | 50 | KCA |
| +037+ | 1.61 | Hiroki Kuroda | 43 | NYA |
| +041+ | 1.54 | Ervin Santana | 42 | KCA |
| +043+ | 1.51 | Yu Darvish | 45.7 | TEX |
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