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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. | Leon Rebello | .3306 | 673 | 1948 | |
| 2. | Leon Rebello | .3306 | 670 | 1947 | |
| 3. | Daniel Armstead | .3293 | 649 | 1948 | |
| 4. | Jack Lieberman | .3241 | 649 | 1950 | |
| 5. | Russell Christman | .3156 | 703 | 1947 | |
| 6. | Sean Hawk | .3124 | 673 | 1947 | |
| 7. | Sean Hawk | .3104 | 689 | 1949 | |
| 8. | Daniel Armstead | .3091 | 633 | 1949 | |
| 9. | Sean Hawk | .3088 | 693 | 1948 | |
| 10. | Todd Ryerson | .3088 | 669 | 1947 | |
| 11. | Rupert McKown | .3055 | 679 | 1949 | |
| 12. | Daniel Armstead | .3043 | 679 | 1947 | |
| 13. | Bill Marquardt | .3035 | 587 | 1947 | |
| 14. | Russell Christman | .3023 | 673 | 1950 | |
| 15. | Bill Marquardt | .3019 | 623 | 1948 | |
| 16. | Rupert McKown | .3017 | 569 | 1947 | |
| 17. | Leon Rebello | .3016 | 689 | 1949 | |
| 18. | Daniel Armstead | .3000 | 660 | 1950 | |
| 19. | Joseph White | .2976 | 550 | 1947 | |
| 20. | Rupert McKown | .2971 | 644 | 1950 | |
| 21. | Seth Uribe | .2965 | 644 | 1947 | |
| 22. | Bill Marquardt | .2957 | 606 | 1949 | |
| 23. | Donald Bobbitt | .2944+ | 446 | 1950 | |
| 24. | David Boyer | .2938 | 599 | 1950 | |
| 25. | Todd Ryerson | .2931 | 653 | 1950 | |
| 26. | Allan Dickerson | .2925 | 644 | 1949 | |
| 27. | William Barnwell | .2913 | 583 | 1950 | |
| 28. | William Barnwell | .2913 | 630 | 1949 | |
| 29. | Russell Christman | .2902 | 551 | 1949 | |
| 30. | Joel Oliveira | .2883+ | 460 | 1949 | |
| 31. | Alonzo Zendejas | .2878 | 703 | 1950 | |
| 32. | Daniel Wilson | .2866 | 515 | 1947 | |
| 33. | Alonzo Zendejas | .2849 | 674 | 1947 | |
| 34. | Jack Lieberman | .2841 | 605 | 1949 | |
| 35. | Alonzo Zendejas | .2839 | 678 | 1948 | |
| 36. | Rupert McKown | .2831 | 672 | 1948 | |
| 37. | Joel Oliveira | .2824+ | 487 | 1950 | |
| 38. | Todd Ryerson | .2819 | 682 | 1948 | |
| 39. | Howard Goldston | .2814 | 604 | 1950 | |
| 40. | Trevor Maury | .2793 | 671 | 1947 | |
| 41. | Leon Rebello | .2775 | 666 | 1950 | |
| 42. | Allan Dickerson | .2768 | 630 | 1947 | |
| 43. | Alonzo Zendejas | .2765 | 658 | 1949 | |
| 44. | Joel Oliveira | .2755 | 688 | 1948 | |
| 45. | Daniel Tague | .2741 | 647 | 1949 | |
| 46. | Trevor Maury | .2724 | 641 | 1948 | |
| 47. | William Barnwell | .2696 | 642 | 1948 | |
| 48. | Sean Hawk | .2689 | 584 | 1950 | |
| 49. | Allan Dickerson | .2681 | 627 | 1950 | |
| 50. | Howard Goldston | .2659 | 525 | 1949 | |
| 51. | Todd Ryerson | .2658 | 587 | 1949 | |
| 52. | Daniel Tague | .2648 | 690 | 1950 | |
| 53. | Daniel Tague | .2620 | 561 | 1948 | |
| 54. | Russell Christman | .2607 | 699 | 1948 | |
| 55. | Seth Uribe | .2574+ | 486 | 1948 | |
| 56. | Joel Oliveira | .2486 | 635 | 1947 | |
| 57. | Howard Goldston | .2378 | 561 | 1948 | |
| 58. | Allan Dickerson | .2357 | 617 | 1948 | |
| 59. | Howard Goldston | .2341+ | 439 | 1947 | |
| 60. | Zacarias Morales | .2291 | 567 | 1949 | |
| 61. | Neil Williams | .2246 | 691 | 1949 | |
| 62. | Neil Williams | .2202 | 738 | 1948 | |
| 63. | Bill Marquardt | .2110+ | 367 | 1950 | |
| 64. | Seth Uribe | .1991+ | 351 | 1950 | |
| 65. | Seth Uribe | .1888+ | 352 | 1949 | |
| 66. | William Barnwell | .1835+ | 342 | 1947 | |
| 67. | Joseph White | .1674+ | 366 | 1948 | |
| Kenneth Schultz | .1674+ | 337 | 1948 | ||
| 69. | Edward Leahy | .1487+ | 420 | 1950 | |
| 70. | Trevor Maury | .1406+ | 342 | 1949 |
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