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| First Basemen Single-Season Batting Average Leaderboard | |
| * - Indicates Hall of Fame
+ - indicates hit-less at-bats added to meet 502PA requirement. |
| Rank | Player | Batting Average | PA | Year | |
| 1. | Dave Orr | .3549 | 675 | 1884 | |
| 2. | Dan Brouthers | .3339 | 650 | 1884 | |
| 3. | Fred Mann | .3185 | 567 | 1884 | |
| 4. | Roger Connor | .3139 | 536 | 1884 | |
| 5. | Juice Latham | .2971+ | 478 | 1884 | |
| 6. | John Reilly | .2946 | 665 | 1884 | |
| 7. | Ed Swartwood | .2933 | 642 | 1884 | |
| 8. | Martin Powell | .2867 | 650 | 1884 | |
| 9. | Harry Stovey | .2828 | 649 | 1884 | |
| 10. | Charlie Comiskey | .2477 | 553 | 1884 | |
| 11. | Jim Tray | .2282 | 559 | 1884 | |
| 12. | Ed Cogswell | .2255+ | 448 | 1884 | |
| 13. | John Morrill | .2224 | 653 | 1884 | |
| 14. | Sid Farrar | .2148 | 559 | 1884 | |
| 15. | Wally Andrews | .1982 | 608 | 1884 |
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