| Starter | Tm | Tier | Game |
|---|---|---|---|
| Barry Zito | SFN | -6.12 | 201309020_SFN_SDN |
| Ian Kennedy | SDN | -4.58 | 201309020_SFN_SDN |
| Edwin Jackson | CHN | -2.98 | 201309030_MIA_CHN |
| Esmil Rogers | TOR | -2.29 | 201309020_TOR_ARI |
| Phil Hughes | NYA | -2.29 | 201309020_CHA_NYA |
Based on accumulated WAA for this season up to 2013-09-03.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +003+ | 9.64 | Clayton Kershaw | 209 | LAN |
| +008+ | 5.63 | Jose Fernandez | 158.7 | MIA |
| +016+ | 4.63 | Yu Darvish | 174.7 | TEX |
| +021+ | 4.27 | Max Scherzer | 190.3 | DET |
| +024+ | 4.2 | Madison Bumgarner | 182.3 | SFN |
| +026+ | 4.14 | Hisashi Iwakuma | 191 | SEA |
| +027+ | 4.13 | Anibal Sanchez | 151.3 | DET |
| +033+ | 3.97 | James Shields | 196 | KCA |
| +035+ | 3.95 | Stephen Strasburg | 164 | WAS |
| +038+ | 3.93 | Mat Latos | 184 | CIN |
| +039+ | 3.9 | Chris Sale | 187.7 | CHA |
| +041+ | 3.85 | Francisco Liriano | 133 | PIT |
| +043+ | 3.81 | Felix Hernandez | 194.3 | SEA |
| +045+ | 3.77 | Zack Greinke | 148.7 | LAN |
| +046+ | 3.76 | Hiroki Kuroda | 177.7 | NYA |
| +049+ | 3.73 | Bartolo Colon | 164.3 | OAK |
| +050+ | 3.65 | Adam Wainwright | 206.7 | SLN |
| +054+ | 3.5 | Cliff Lee | 183.7 | PHI |
| +056+ | 3.44 | Derek Holland | 184.7 | TEX |
| +057+ | 3.41 | Patrick Corbin | 182.7 | ARI |
| +059+ | 3.33 | Hyun-Jin Ryu | 167 | LAN |
| +064+ | 3.22 | Julio Teheran | 161.3 | ATL |
| +065+ | 3.19 | Mike Minor | 172.7 | ATL |
| +067+ | 3.15 | Jhoulys Chacin | 176.3 | COL |
| +072+ | 3 | Ervin Santana | 180.7 | KCA |
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