| 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 |
| Tyler Chatwood | COL | -1.71 | 201304290_COL_LAN |
Based on accumulated WAA for this season up to 2013-05-01.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 3.09 | Clay Buchholz | 44.7 | BOS |
| +003+ | 2.42 | Jordan Zimmermann | 44 | WAS |
| +005+ | 2.25 | Madison Bumgarner | 40.7 | SFN |
| +007+ | 2.21 | Clayton Kershaw | 41.7 | LAN |
| +009+ | 2.2 | Matt Moore | 32 | TBA |
| +010+ | 2.19 | Matt Harvey | 40.3 | NYN |
| +011+ | 2.04 | Felix Hernandez | 42.7 | SEA |
| +012+ | 2 | Hisashi Iwakuma | 37.7 | SEA |
| +013+ | 1.96 | Adam Wainwright | 44.3 | SLN |
| +016+ | 1.9 | Jake Westbrook | 27.7 | SLN |
| +017+ | 1.86 | Mat Latos | 39.3 | CIN |
| +018+ | 1.85 | Anibal Sanchez | 39.7 | DET |
| +019+ | 1.82 | Justin Verlander | 39.3 | DET |
| +027+ | 1.52 | Kevin Slowey | 37.7 | MIA |
| +028+ | 1.52 | Kevin Correia | 36.3 | MIN |
| +029+ | 1.51 | Yu Darvish | 38.7 | TEX |
| +034+ | 1.42 | Patrick Corbin | 33 | ARI |
| +037+ | 1.42 | Ross Detwiler | 31 | WAS |
| +038+ | 1.41 | Hiroki Kuroda | 36 | NYA |
| +040+ | 1.39 | Carlos Villanueva | 35.3 | CHN |
| +043+ | 1.34 | Shelby Miller | 30.7 | SLN |
| +045+ | 1.31 | Kyle Kendrick | 33.7 | PHI |
| +047+ | 1.29 | Travis Wood | 32 | CHN |
| +048+ | 1.25 | Alex Cobb | 35.3 | TBA |
| XXXXX | 1.19 | Jaime Garcia | 36 | SLN |
_