First Basemen Single-Season
On-Base Pct
Leaderboard
 
* - Indicates Hall of Fame
+ - indicates hit-less at-bats added to meet 502PA requirement.
Rank    Player On-Base Pct PA Year Career Leaderboard
1.    Rod Carew .4441 646 1978  
2.    Randy Spratt .4396 646 1981  
3.    Jerome McDunnell .4245 671 1981  
4.    Bombo Vadabonceour * .4208 663 1980  
5.    Bob Oberdorsten .4190 645 1975  
6.    Flavio Luna .4186 645 1994  
7.    Randy Spratt .4186 659 1983  
8.    Bombo Vadabonceour * .4178 675 1979  
9.    Bob Oberdorsten .4175 728 1973  
10.    Flavio Luna .4144 637 1989  
11.    Rick Habin .4124 662 1975  
12.    Jerome McDunnell .4122 642 1980  
13.    Jake Taylor .4099 666 1975  
14.    Randy Spratt .4096 686 1987  
15.    Lou Collins .4091 704 1973  
16.    Jesus Clemente .4086 537 1973  
17.    Randy Spratt .4079 657 1990  
18.    Rod Carew .4069 670 1979  
19.    Randy Spratt .4061 655 1986  
20.    Ted Sale .4030 665 1991  
21.    Fred Mahaffey .4003 647 1988  
22.    Flavio Luna .3994 661 1991  
23.    Mickey Masutto .3992 511 1980  
24.    Jerome McDunnell .3990 615 1978  
25.    Ted Sale .3988 679 1987  
26.    Ted Sale .3988 652 1994  
27.    Willy Moore .3987 639 1985  
28.    Bombo Vadabonceour * .3985 651 1984  
29.    Bombo Vadabonceour * .3981 652 1987  
30.    Rick Habin .3977 709 1973  
31.    Jason Bilford .3976 674 1986  
32.    Rick Habin .3964 671 1977  
33.    Chick Hustle .3964+ 464 1986  
34.    Bombo Vadabonceour * .3962 685 1985  
35.    Wilford Rarick .3955 534 1981  
36.    Bob Oberdorsten .3938 646 1978  
37.    Nolan Berran .3933 662 1987  
38.    Zachary Johnson .3933 656 1975  
39.    Randy Spratt .3927 657 1989  
40.    Jeff Lebertall .3924+ 496 1977  
41.    Mickey Masutto .3921 630 1978  
42.    Willy Moore .3913 653 1991  
43.    Bob Oberdorsten .3911 726 1974  
44.    Bob Oberdorsten .3904 650 1977  
45.    Bob Oberdorsten .3903 639 1981  
46.    Rich Barbato .3902 539 1981  
47.    Wilford Rarick .3900 652 1978  
48.    Gregorio Cazares .3894 625 1981  
49.    Ted Sale .3890 527 1992  
50.    Flavio Luna .3889 630 1990  
51.    Akiru Matsumoto .3884 623 1994  
52.    Randy Spratt .3883 618 1984  
53.    Randy Spratt .3883 667 1980  
54.    Bob Oberdorsten .3882 627 1979  
55.    Gregorio Cazares .3881 604 1979  
56.    Ted Sale .3876 645 1993  
57.    Jerome McDunnell .3872 502 1975  
58.    Mickey Masutto .3870 708 1973  
59.    Al Niden .3869 548 1975  
60.    Stephen Shier .3867 601 1980  
61.    Flavio Luna .3866 670 1992  
62.    Randy Spratt .3864 617 1991  
63.    Bombo Vadabonceour * .3862 650 1983  
64.    Bombo Vadabonceour * .3861 663 1977  
65.    Rod Carew .3859 672 1980  
66.    Willy Moore .3856 630 1984  
67.    Randy Spratt .3853 670 1979  
68.    Chick Hustle .3851 651 1994  
69.    Fred Mahaffey .3846 598 1980  
70.    Denny Walling .3842 585 1985  
71.    Dick Allen .3835 532 1980  
72.    Rick Leach .3832 585 1986  
73.    Akiru Matsumoto .3828 653 1992  
74.    Jerome McDunnell .3827 520 1974  
75.    Zachary Johnson .3825 617 1976  
76.    Jason Bilford .3825 651 1983  
  Zachary Johnson .3825 651 1974  
78.    Billy Wilson .3822 675 1987  
79.    Rick Habin .3822 662 1976  
80.    Mickey Masutto .3818 641 1974  
81.    Rich Barbato .3812 633 1988  
82.    Warren Cromartie .3810 532 1989  
  Jerry Johnson .3810 630 1988  
84.    Randy Spratt .3808 667 1982  
85.    Jake Taylor .3806 649 1974  
86.    Ted Sale .3796 649 1988  
87.    Wilford Rarick .3795 609 1979  
88.    Luis Abdullah .3790 595 1978  
89.    Willy Moore .3790 658 1982  
90.    Dick Allen .3787 681 1975  
91.    Jack Dark .3785+ 479 1987  
92.    Dave Manzanillo .3779 598 1991  
93.    James Jordan .3779 569 1973  
94.    Bombo Vadabonceour * .3778 659 1981  
95.    Jack Dark .3767 645 1989  
96.    Chick Hustle .3767 520 1987  
97.    Zachary Johnson .3766 709 1973  
98.    Tony Solaita .3765+ 499 1981  
99.    Bob Oberdorsten .3765 675 1980  
100.    Flavio Luna .3763 660 1993