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| First Basemen Single-Season Fielding Pct Leaderboard | |
| * - Indicates Hall of Fame |
| Rank | Player | Fielding Pct | IP | Year | |
| 1. | Bill Marquardt | .9975 | 1128.7 | 1947 | |
| 2. | Allan Dickerson | .9969 | 1365.7 | 1947 | |
| 3. | Allan Dickerson | .9968 | 1355.3 | 1948 | |
| 4. | Rupert McKown | .9960 | 1194.7 | 1947 | |
| 5. | Russell Christman | .9956 | 1117.7 | 1949 | |
| 6. | Russell Christman | .9952 | 1310.7 | 1950 | |
| 7. | Alonzo Zendejas | .9952 | 1279.0 | 1947 | |
| 8. | Seth Uribe | .9951 | 1339.3 | 1947 | |
| 9. | Trevor Maury | .9950 | 1328.3 | 1947 | |
| 10. | John To | .9950 | 1312.3 | 1947 | |
| 11. | Zacarias Morales | .9949 | 1173.3 | 1949 | |
| 12. | Leon Rebello | .9949 | 1324.3 | 1949 | |
| 13. | Russell Christman | .9946 | 1333.7 | 1947 | |
| 14. | Bill Marquardt | .9945 | 1195.0 | 1949 | |
| 15. | Neil Williams | .9944 | 1443.7 | 1949 | |
| 16. | Rupert McKown | .9942 | 1352.3 | 1948 | |
| 17. | Neil Williams | .9940 | 1441.0 | 1948 | |
| 18. | William Barnwell | .9939 | 1123.3 | 1950 | |
| 19. | Leon Rebello | .9938 | 1301.3 | 1948 | |
| 20. | Todd Ryerson | .9938 | 1364.0 | 1948 | |
| 21. | Russell Christman | .9937 | 1345.7 | 1948 | |
| 22. | Alonzo Zendejas | .9936 | 1303.7 | 1950 | |
| 23. | Joel Oliveira | .9935 | 1421.3 | 1948 | |
| 24. | Joel Oliveira | .9935 | 1273.3 | 1947 | |
| 25. | Todd Ryerson | .9932 | 1288.3 | 1950 | |
| 26. | Sean Hawk | .9931 | 1303.7 | 1949 | |
| 27. | Howard Goldston | .9930 | 1220.7 | 1950 | |
| 28. | Allan Dickerson | .9928 | 1347.7 | 1949 | |
| 29. | Alonzo Zendejas | .9927 | 1342.7 | 1948 | |
| 30. | Leon Rebello | .9923 | 1317.7 | 1950 | |
| 31. | Joseph White | .9922 | 1201.3 | 1947 | |
| 32. | Todd Ryerson | .9921 | 1165.3 | 1949 | |
| 33. | Sean Hawk | .9921 | 1108.3 | 1950 | |
| 34. | William Barnwell | .9920 | 1257.0 | 1948 | |
| 35. | Rupert McKown | .9920 | 1305.3 | 1949 | |
| 36. | Daniel Tague | .9918 | 1341.7 | 1949 | |
| 37. | Allan Dickerson | .9917 | 1332.7 | 1950 | |
| 38. | Jack Lieberman | .9917 | 1345.7 | 1950 | |
| 39. | Howard Goldston | .9916 | 1019.0 | 1949 | |
| 40. | Daniel Tague | .9916 | 1411.0 | 1950 | |
| 41. | Trevor Maury | .9913 | 1246.0 | 1948 | |
| 42. | Alonzo Zendejas | .9913 | 1316.3 | 1949 | |
| 43. | John To | .9910 | 1312.0 | 1948 | |
| 44. | Sean Hawk | .9909 | 1294.3 | 1947 | |
| 45. | Bill Marquardt | .9909 | 1231.0 | 1948 | |
| 46. | Daniel Armstead | .9906 | 1333.0 | 1948 | |
| 47. | William Barnwell | .9906 | 1316.3 | 1949 | |
| 48. | Alvin Chao | .9905 | 1449.3 | 1950 | |
| 49. | Jack Lieberman | .9901 | 1272.7 | 1949 | |
| 50. | Daniel Tague | .9900 | 1008.7 | 1948 | |
| 51. | Daniel Armstead | .9897 | 1318.7 | 1950 | |
| 52. | Daniel Wilson | .9893 | 976.3 | 1947 | |
| 53. | Todd Ryerson | .9891 | 1316.7 | 1947 | |
| 54. | Leon Rebello | .9891 | 1303.7 | 1947 | |
| 55. | Rupert McKown | .9888 | 1295.7 | 1950 | |
| 56. | Daniel Armstead | .9881 | 1340.3 | 1947 | |
| 57. | Daniel Armstead | .9879 | 1318.3 | 1949 | |
| 58. | David Boyer | .9879 | 1244.3 | 1950 | |
| 59. | Sean Hawk | .9879 | 1307.7 | 1948 | |
| 60. | Howard Goldston | .9867 | 1115.7 | 1948 |
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