Mark McGwire
Records
† – tied with Sammy Sosa †† – tied with Babe Ruth and Sammy Sosa

Mark McGwire

Section Title: Records
Table Section Text: † – tied with Sammy Sosa †† – tied with Babe Ruth and Sammy Sosa

Accomplishment	Record	Date(s)	Refs

Major League Baseball records

Fewest at-bats to 500 career home runs	5,487	1999

Fewest career at bats per home run	10.6

Home runs in a four-season period	245	1996–1999

Consecutive 50-HR seasons	4†

50-HR seasons	4††

Consecutive 60-HR seasons	2†	1998–1999

Home runs in a two-season period	135

Single-season highest RBI/H ratio	1.014	1999

Oakland Athletics records

Lowest career AB/HR ratio	12.1

Career HR	363

Lowest single-season AB/HR ratio	8.1	1995, 1996

St. Louis Cardinals records

Lowest career AB/HR ratio	7.9

Highest career OPS	1.222

Highest career OPS+	180

Highest career SLG	.683

Lowest single-season AB/HR ratio	7.3	1998

Most HR in a season	70

Most times on base in a season	320

Most bases on balls in a season	162

Sentence(s)

Mark McGwire owned the highest four-season HR total, with 245 from 1996 to 1999.

final_sentence: Mark McGwire owned the highest four-season HR total, with 245 from 1996 to 1999.