| Starter | Tm | Tier | Game |
|---|---|---|---|
| Wilbur Wood | CHA | 17.02 | 197305060_NYA_CHA |
| Gaylord Perry | CLE | 5.4 | 197305040_OAK_CLE |
| Jim Palmer | BAL | 4.76 | 197305060_ANA_BAL |
| Bert Blyleven | MIN | 3.66 | 197305050_BOS_MIN |
| Mickey Lolich | DET | 3.26 | 197305060_TEX_DET |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Wayne Simpson | KCA | -3.98 | 197305050_KCA_MIL |
| Ron Reed | ATL | -3.63 | 197305040_ATL_PHI |
| Jerry Reuss | HOU | -1.49 | 197305060_HOU_NYN |
| Johnny Odom | OAK | -1.34 | 197305050_OAK_CLE |
| Mike Corkins | SDN | -1.31 | 197305050_PIT_SDN |
Based on accumulated WAA for this season up to 1973-05-06.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 4.05 | Wilbur Wood | 73.3 | CHA |
| +002+ | 3.03 | Ken Holtzman | 62.7 | OAK |
| +003+ | 2.58 | Dave McNally | 57.3 | BAL |
| +005+ | 2.32 | Bill Singer | 50.7 | ANA |
| +007+ | 2.21 | Joe Coleman | 55 | DET |
| +008+ | 2.2 | Don Sutton | 51 | LAN |
| +010+ | 2.14 | Ron Bryant | 54.3 | SFN |
| +012+ | 2.02 | Tom Seaver | 47.3 | NYN |
| +014+ | 1.97 | Rick Reuschel | 36 | CHN |
| +018+ | 1.79 | Bill Greif | 28 | SDN |
| +021+ | 1.69 | Rudy May | 33 | ANA |
| +023+ | 1.55 | Nolan Ryan | 61.7 | ANA |
| +024+ | 1.53 | Jerry Reuss | 50.7 | HOU |
| +025+ | 1.53 | Jerry Koosman | 41.3 | NYN |
| +027+ | 1.48 | Jim Perry | 41 | DET |
| +030+ | 1.39 | Gaylord Perry | 58 | CLE |
| +033+ | 1.36 | Carl Morton | 46 | ATL |
| +035+ | 1.3 | Ross Grimsley | 45.3 | CIN |
| +037+ | 1.25 | Rogelio Moret | 14.7 | BOS |
| XXXXX | 1.18 | Al Downing | 35.7 | LAN |
| XXXXX | 1.16 | Don Gullett | 53.7 | CIN |
| XXXXX | 1.07 | Jim Barr | 46.3 | SFN |
| XXXXX | 1.06 | Bob Gibson | 48 | SLN |
| XXXXX | 1.03 | Roger Nelson | 29.7 | CIN |
| XXXXX | 1 | Luke Walker | 12.3 | PIT |
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