How many home runs did Mark McGwire have in 1999?
651999 Regular Season
Mark McGwire recorded 65 home runs in the 1999 regular season, 1st in the MLB.
- 2nd-best of Mark McGwire's 16 seasons on file; the high is 70 in 1998.
- Down 5 from 70 in 1998.
- 34% of the St. Louis Cardinals' home runs that regular season.
Figures come from ESPN's box scores and were last read on September 21, 2026.
| GP: Games the player appeared in, however briefly. | AB: At-bats: trips to the plate that ended in a hit, an out or an error. Walks and sacrifices are not counted. | R: Runs — scored by the batter, or allowed by the pitcher. | H: Times the batter reached base by hitting the ball, without help from an error. | HR: Home runs hit. | RBI: Runs that scored because of this batter's plate appearance. | SB: Bases taken while the pitcher was delivering. Being caught is counted separately. | AVG: Hits per at-bat. .300 is the traditional line between a good hitter and a great one. | OBP: Share of plate appearances that ended with the batter on base — hits, walks and hit-by-pitches. | SLG: Total bases per at-bat, so a home run counts four times a single. | OPS: On-base percentage plus slugging. Around .800 is All-Star level, .900 is MVP territory. | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1986 |  ATH | 18 | 53 | 10 | 10 | 3 | 9 | 0 | .189 | .259 | .377 | .636 |
| 1987 | ATH | 151 | 557 | 97 | 161 | 49 | 118 | 1 | .289 | .370 | .618 | .987 |
| 1988 | ATH | 155 | 550 | 87 | 143 | 32 | 99 | 0 | .260 | .352 | .478 | .830 |
| 1989 | ATH | 143 | 490 | 74 | 113 | 33 | 95 | 1 | .231 | .339 | .467 | .806 |
| 1990 | ATH | 156 | 523 | 87 | 123 | 39 | 108 | 2 | .235 | .370 | .489 | .859 |
| 1991 | ATH | 154 | 483 | 62 | 97 | 22 | 75 | 2 | .201 | .330 | .383 | .714 |
| 1992 | ATH | 139 | 467 | 87 | 125 | 42 | 104 | 0 | .268 | .385 | .585 | .970 |
| 1993 | ATH | 27 | 84 | 16 | 28 | 9 | 24 | 0 | .333 | .467 | .726 | 1.193 |
| 1994 | ATH | 47 | 135 | 26 | 34 | 9 | 25 | 0 | .252 | .413 | .474 | .887 |
| 1995 | ATH | 104 | 317 | 75 | 87 | 39 | 90 | 1 | .274 | .441 | .685 | 1.125 |
| 1996 | ATH | 130 | 423 | 104 | 132 | 52 | 113 | 0 | .312 | .467 | .730 | 1.198 |
| 1997 |  ATH/STL | 156 | 540 | 86 | 148 | 58 | 123 | 3 | .274 | .393 | .646 | 1.039 |
| 1998 | STL | 155 | 509 | 130 | 152 | 70 | 147 | 1 | .299 | .470 | .752 | 1.222 |
| 1999 | STL | 153 | 521 | 118 | 145 | 65 | 147 | 0 | .278 | .424 | .697 | 1.120 |
| 2000 | STL | 89 | 236 | 60 | 72 | 32 | 73 | 1 | .305 | .483 | .746 | 1.229 |
| 2001 | STL | 97 | 299 | 48 | 56 | 29 | 64 | 0 | .187 | .316 | .492 | .808 |
What the columns mean: AB · R · H · HR · RBI · SB · AVG · OBP · SLG · OPS