| Starter | Tm | Tier | Game |
|---|---|---|---|
| Ubaldo Jimenez | CLE | -6.49 | 201304210_CLE_HOU |
| Jeff Francis | COL | -5.07 | 201304231_ATL_COL |
| Jonathan Sanchez | PIT | -3.66 | 201304210_ATL_PIT |
| Jake Arrieta | BAL | -3.44 | 201304210_LAN_BAL |
| Joe Blanton | ANA | -3.11 | 201304220_TEX_ANA |
Based on accumulated WAA for this season up to 2013-04-23.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 2.1 | Clay Buchholz | 30 | BOS |
| +002+ | 2.03 | Matt Harvey | 29 | NYN |
| +006+ | 1.76 | Matt Moore | 26 | TBA |
| +007+ | 1.76 | Paul Maholm | 26.3 | ATL |
| +009+ | 1.67 | Adam Wainwright | 37.3 | SLN |
| +010+ | 1.62 | Justin Masterson | 34 | CLE |
| +011+ | 1.6 | Carlos Villanueva | 29.3 | CHN |
| +015+ | 1.52 | Ross Detwiler | 26 | WAS |
| +021+ | 1.45 | Felix Hernandez | 34.7 | SEA |
| +023+ | 1.43 | Clayton Kershaw | 33.7 | LAN |
| +024+ | 1.4 | Shelby Miller | 25 | SLN |
| +026+ | 1.39 | Jhoulys Chacin | 24.7 | COL |
| +027+ | 1.38 | Hisashi Iwakuma | 31.7 | SEA |
| +029+ | 1.31 | Jake Westbrook | 21.7 | SLN |
| +032+ | 1.27 | Wandy Rodriguez | 16 | PIT |
| XXXXX | 1.22 | Mike Minor | 25 | ATL |
| XXXXX | 1.2 | Patrick Corbin | 26.3 | ARI |
| XXXXX | 1.18 | Anibal Sanchez | 25.7 | DET |
| XXXXX | 1.17 | Yu Darvish | 26.7 | TEX |
| XXXXX | 1.12 | Madison Bumgarner | 26.3 | SFN |
| XXXXX | 1.11 | Kevin Slowey | 23.7 | MIA |
| XXXXX | 1.09 | Travis Wood | 26 | CHN |
| XXXXX | 1.08 | Doug Fister | 27 | DET |
| XXXXX | 1.01 | Kris Medlen | 25 | ATL |
| XXXXX | 0.98 | Ervin Santana | 29 | KCA |
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