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| First Basemen Single-Season Slugging Pct Leaderboard | |
| * - Indicates Hall of Fame
+ - indicates hit-less at-bats added to meet 502PA requirement. |
| Rank | Player | Slugging Pct | PA | Year | |
| 1. | Dave Orr | .5079 | 675 | 1884 | |
| 2. | Dan Brouthers | .4650 | 650 | 1884 | |
| 3. | Roger Connor | .4387 | 536 | 1884 | |
| 4. | Fred Mann | .4324 | 567 | 1884 | |
| 5. | John Reilly | .4283 | 665 | 1884 | |
| 6. | Harry Stovey | .3986 | 649 | 1884 | |
| 7. | Juice Latham | .3724+ | 478 | 1884 | |
| 8. | Ed Swartwood | .3722 | 642 | 1884 | |
| 9. | Martin Powell | .3400 | 650 | 1884 | |
| 10. | John Morrill | .3130 | 653 | 1884 | |
| 11. | Charlie Comiskey | .3031 | 553 | 1884 | |
| 12. | Jim Tray | .2979 | 559 | 1884 | |
| 13. | Sid Farrar | .2795 | 559 | 1884 | |
| 14. | Ed Cogswell | .2756+ | 448 | 1884 | |
| 15. | Wally Andrews | .2667 | 608 | 1884 |
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