Jason Giambi has the highest on-base percentage by an Oakland Athletics first baseman in a season, with an on-base percentage of .477 in 2001.
| NAME | OBP | SEASON | TM | G | AB | R | H | 2B | 3B | HR | RBI | BB | HBP | SO | SB | CS | PA | TB | XBH | SH | SF | IBB | GIDP | AVG | SLG | OPS | wRC | WRAA | wOBA | wRC+ | BRAA | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | J. Giambi | .477 | 2001 | 154 | 520 | 109 | 178 | 47 | 2 | 38 | 120 | 129 | 13 | 83 | 2 | 0 | 671 | 343 | 87 | 0 | 9 | 24 | 17 | .342 | .660 | 1.137 | 162 | 78.3 | .465 | 193 | 78.7 | |
| 2 | | J. Giambi | .476 | 2000 | 152 | 510 | 108 | 170 | 29 | 1 | 43 | 137 | 137 | 9 | 96 | 2 | 0 | 664 | 330 | 73 | 0 | 8 | 6 | 9 | .333 | .647 | 1.123 | 163 | 75.5 | .471 | 182 | 74.3 | |
| 3 | | J. Foxx | .469 | 1932 | 154 | 585 | 151 | 213 | 33 | 9 | 58 | 169 | 116 | 0 | 96 | 3 | 7 | 701 | 438 | 100 | 0 | .364 | .749 | 1.218 | 193 | 105.6 | .522 | 198 | 95.8 | ||||
| 4 |  | M. McGwire | .467 | 1996 | 130 | 423 | 104 | 132 | 21 | 0 | 52 | 113 | 116 | 8 | 112 | 0 | 0 | 548 | 309 | 73 | 0 | 1 | 16 | 14 | .312 | .730 | 1.198 | 142 | 71.8 | .489 | 190 | 68.5 | |
| 5 | | J. Foxx | .463 | 1929 | 149 | 517 | 123 | 183 | 23 | 9 | 33 | 118 | 103 | 2 | 70 | 9 | 7 | 638 | 323 | 65 | 16 | .354 | .625 | 1.088 | 153 | 68.6 | .480 | 176 | 66.1 | ||||
| 6 | | J. Foxx | .461 | 1935 | 147 | 535 | 118 | 185 | 33 | 7 | 36 | 115 | 114 | 0 | 99 | 6 | 4 | 649 | 340 | 76 | 0 | .346 | .636 | 1.096 | 157 | 75.6 | .485 | 175 | 67.4 | ||||
| 7 | | F. Fain | .451 | 1951 | 117 | 425 | 63 | 146 | 30 | 3 | 6 | 57 | 80 | 3 | 20 | 0 | 3 | 511 | 200 | 39 | 3 | 10 | .344 | .471 | .921 | 97 | 36.7 | .428 | 150 | 31.8 | |||
| 8 | | J. Foxx | .449 | 1933 | 149 | 573 | 125 | 204 | 37 | 9 | 48 | 163 | 96 | 1 | 93 | 2 | 2 | 670 | 403 | 94 | 0 | .356 | .703 | 1.153 | 170 | 92.1 | .510 | 189 | 79.8 | ||||
| 9 | | J. Foxx | .449 | 1934 | 150 | 539 | 120 | 180 | 28 | 6 | 44 | 130 | 111 | 1 | 75 | 11 | 2 | 652 | 352 | 78 | 1 | .334 | .653 | 1.102 | 157 | 75.5 | .484 | 171 | 64.4 | ||||
| 10 | | M. McGwire | .441 | 1995 | 104 | 317 | 75 | 87 | 13 | 0 | 39 | 90 | 88 | 11 | 77 | 1 | 1 | 422 | 217 | 52 | 0 | 6 | 5 | 9 | .274 | .685 | 1.125 | 99 | 46.7 | .466 | 183 | 45.9 | |
| 11 | | F. Fain | .438 | 1952 | 145 | 538 | 82 | 176 | 43 | 3 | 2 | 59 | 105 | 1 | 26 | 3 | 5 | 648 | 231 | 48 | 4 | 19 | .327 | .429 | .867 | 110 | 39.1 | .407 | 142 | 31.7 | |||
| 12 | | F. Fain | .430 | 1950 | 151 | 522 | 83 | 147 | 25 | 4 | 10 | 83 | 133 | 3 | 26 | 8 | 5 | 658 | 210 | 39 | 0 | 18 | .282 | .402 | .832 | 109 | 27 | .396 | 119 | 17.5 | |||
| 13 | | J. Foxx | .429 | 1930 | 153 | 562 | 127 | 188 | 33 | 13 | 37 | 156 | 93 | 0 | 66 | 7 | 7 | 673 | 358 | 83 | 18 | .335 | .637 | 1.066 | 156 | 61 | .458 | 159 | 57 | ||||
| 14 | | J. Giambi | .422 | 1999 | 158 | 575 | 115 | 181 | 36 | 1 | 33 | 123 | 105 | 7 | 106 | 1 | 1 | 695 | 318 | 70 | 0 | 8 | 6 | 11 | .315 | .553 | .975 | 137 | 46.6 | .418 | 149 | 46 | |
| 15 | | F. Fain | .415 | 1949 | 150 | 525 | 81 | 138 | 21 | 5 | 3 | 78 | 136 | 0 | 51 | 8 | 1 | 672 | 178 | 29 | 11 | 15 | .263 | .339 | .754 | 95 | 15.2 | .372 | 109 | 7.7 | |||
| 16 | | F. Fain | .414 | 1947 | 136 | 461 | 70 | 134 | 28 | 6 | 7 | 71 | 95 | 2 | 34 | 4 | 5 | 567 | 195 | 41 | 9 | 15 | .291 | .423 | .837 | 90 | 26 | .396 | 137 | 24.4 | |||
| 17 | | N. Siebern | .412 | 1962 | 162 | 600 | 114 | 185 | 25 | 6 | 25 | 117 | 110 | 1 | 88 | 3 | 1 | 719 | 297 | 56 | 1 | 7 | 9 | 13 | .308 | .495 | .907 | 128 | 44.4 | .400 | 138 | 34.1 | |
| 18 | | F. Fain | .412 | 1948 | 145 | 520 | 81 | 146 | 27 | 6 | 7 | 88 | 113 | 3 | 37 | 10 | 5 | 644 | 206 | 40 | 8 | 17 | .281 | .396 | .808 | 99 | 23.3 | .388 | 121 | 17.1 | |||
| 19 | | J. Hauser | .398 | 1923 | 146 | 537 | 93 | 165 | 21 | 9 | 17 | 94 | 69 | 12 | 52 | 6 | 6 | 634 | 255 | 47 | 16 | .307 | .475 | .873 | 108 | 29.6 | .405 | 127 | 22.6 | ||||
| 20 |  | N. Kurtz | .396 | 2026 | 99 | 352 | 62 | 90 | 15 | 1 | 21 | 69 | 79 | 3 | 141 | 7 | 1 | 434 | 170 | 37 | 0 | 0 | 9 | 5 | .256 | .483 | .879 | 74 | 22.5 | .381 | 138 | 19.3 | |
| 21 | | J. Dykes | .394 | 1927 | 121 | 417 | 61 | 135 | 33 | 6 | 3 | 60 | 44 | 4 | 23 | 2 | 3 | 480 | 189 | 42 | 15 | .324 | .453 | .847 | 77 | 18.4 | .393 | 117 | 11.3 | ||||
| 22 | | D. Barton | .393 | 2010 | 159 | 556 | 79 | 152 | 33 | 5 | 10 | 57 | 110 | 3 | 102 | 7 | 3 | 686 | 225 | 48 | 12 | 5 | 2 | 8 | .273 | .405 | .798 | 100 | 21.2 | .360 | 127 | 21.6 | |
| 23 | | G. Burns | .390 | 1918 | 130 | 505 | 61 | 178 | 22 | 9 | 6 | 70 | 23 | 8 | 25 | 8 | 544 | 236 | 37 | 8 | .352 | .467 | .857 | 88 | 34.9 | .414 | 153 | 29.9 | |||||
| 24 | | G. Tenace | .387 | 1973 | 160 | 510 | 83 | 132 | 18 | 2 | 24 | 84 | 101 | 10 | 94 | 2 | 2 | 636 | 226 | 44 | 8 | 7 | 8 | 13 | .259 | .443 | .830 | 97 | 27.2 | .375 | 141 | 29.7 | |
| 25 | | D. Siebert | .387 | 1944 | 132 | 468 | 52 | 143 | 27 | 5 | 6 | 52 | 62 | 0 | 17 | 2 | 0 | 535 | 198 | 38 | 5 | 5 | .306 | .423 | .810 | 80 | 22.4 | .383 | 131 | 18.8 | |||
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More Athletics Stats
Team Batting Leaders 
HR
23
Langeliers
RBI
69
Kurtz
AVG
.277
Bolte
Team Pitching Leaders
W
9
Ginn
K
140
Perkins
ERA
3.71
Ginn
Team Rankings
HR
194
11th
R
699
20th
SO
1,356
14th
ERA
5.51
29th
Rangers
Mariners
Angels
MLB 2026 Batting Leaders
MLB 2026 Pitching Leaders
MLB Fantasy 2026
MLB 2026 Betting
MLB 2026 Standings
| NL East | W | L | PCT | GB |
|---|---|---|---|---|
 Braves - y | 94 | 68 | .580 | |
 Phillies - w | 88 | 74 | .543 | 6.0 |
80 | 82 | .494 | 14.0 | |
77 | 85 | .475 | 17.0 | |
74 | 88 | .457 | 20.0 | |
| NL Central | W | L | PCT | GB |
 Brewers - y | 103 | 59 | .636 | |
 Cubs - w | 89 | 73 | .549 | 14.0 |
82 | 80 | .506 | 21.0 | |
77 | 85 | .475 | 26.0 | |
75 | 87 | .463 | 28.0 | |
| NL West | W | L | PCT | GB |
 Dodgers - y | 100 | 62 | .617 | |
 Padres - w | 91 | 71 | .562 | 9.0 |
86 | 76 | .531 | 14.0 | |
65 | 97 | .401 | 35.0 | |
58 | 104 | .358 | 42.0 |
Marlins
Nationals
Mets
Pirates
Cardinals
Reds
Diamondbacks
Giants
Rockies| AL East | W | L | PCT | GB |
|---|---|---|---|---|
 Rays - y | 98 | 64 | .605 | |
 Yankees - w | 93 | 68 | .578 | 4.5 |
 Red Sox - w | 87 | 75 | .537 | 11.0 |
79 | 82 | .491 | 18.5 | |
79 | 83 | .488 | 19.0 | |
| AL Central | W | L | PCT | GB |
 Guardians - y | 85 | 77 | .525 | |
 White Sox - w | 84 | 78 | .519 | 1.0 |
77 | 85 | .475 | 8.0 | |
76 | 86 | .469 | 9.0 | |
69 | 93 | .426 | 16.0 | |
| AL West | W | L | PCT | GB |
 Astros - y | 81 | 81 | .500 | |
80 | 82 | .494 | 1.0 | |
76 | 86 | .469 | 5.0 | |
64 | 98 | .395 | 17.0 | |
62 | 100 | .383 | 19.0 |
Orioles
Blue Jays
Twins
Tigers
Royals