| Starter | Tm | Tier | Game |
|---|---|---|---|
| Rick Porcello | DET | -4.92 | 201305020_DET_HOU |
| Joe Blanton | ANA | -3.52 | 201305020_BAL_ANA |
| Philip Humber | HOU | -2.95 | 201304300_HOU_NYA |
| Edinson Volquez | SDN | -2.62 | 201304300_SDN_CHN |
| J.A. Happ | TOR | -1.95 | 201305020_BOS_TOR |
Based on accumulated WAA for this season up to 2013-05-02.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 3.08 | Clay Buchholz | 44.7 | BOS |
| +003+ | 2.4 | Jordan Zimmermann | 44 | WAS |
| +006+ | 2.24 | Madison Bumgarner | 40.7 | SFN |
| +007+ | 2.23 | Jake Westbrook | 33.7 | SLN |
| +009+ | 2.19 | Clayton Kershaw | 41.7 | LAN |
| +010+ | 2.18 | Matt Moore | 32 | TBA |
| +011+ | 2.17 | Matt Harvey | 40.3 | NYN |
| +012+ | 2.03 | Felix Hernandez | 42.7 | SEA |
| +013+ | 1.99 | Hisashi Iwakuma | 37.7 | SEA |
| +016+ | 1.94 | Adam Wainwright | 44.3 | SLN |
| +018+ | 1.84 | Mat Latos | 39.3 | CIN |
| +019+ | 1.77 | Anibal Sanchez | 39.7 | DET |
| +021+ | 1.75 | Justin Verlander | 39.3 | DET |
| +025+ | 1.53 | Kyle Kendrick | 40.7 | PHI |
| +026+ | 1.52 | Kevin Slowey | 37.7 | MIA |
| +031+ | 1.5 | Yu Darvish | 38.7 | TEX |
| +028+ | 1.5 | Kevin Correia | 36.3 | MIN |
| +037+ | 1.41 | Patrick Corbin | 33 | ARI |
| +038+ | 1.4 | Ross Detwiler | 31 | WAS |
| +039+ | 1.4 | Hiroki Kuroda | 36 | NYA |
| +042+ | 1.37 | Carlos Villanueva | 35.3 | CHN |
| +044+ | 1.35 | Travis Wood | 39.7 | CHN |
| +045+ | 1.32 | Shelby Miller | 30.7 | SLN |
| XXXXX | 1.24 | Alex Cobb | 35.3 | TBA |
| XXXXX | 1.18 | Jaime Garcia | 36 | SLN |
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