How many home runs did Mark McGwire have in 1998?
701998 Regular Season
Mark McGwire recorded 70 home runs in the 1998 regular season, 1st in the MLB.
- Mark McGwire's best regular season for home runs in 16 seasons on file.
- Up 12 from 58 in 1997.
- 35% of the St. Louis Cardinals' home runs that regular season.
Best of 16 regular seasons, 1986 through 2001. Figures come from ESPN's box scores and were last read on September 23, 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