A part of the 1998 Major League Baseball home run record chase of Roger Maris' 61 with the Cardinals, McGwire set the major league single-season home run record with 70, which Barry Bonds broke three years later with 73. McGwire also led the league in runs batted in, twice in bases on balls and on-base percentage, and four times in slugging percentage. Injuries significantly cut into his playing time in 2000 and 2001 before factoring into his retirement. He finished with 583 home runs, which was fifth all-time when he retired.

This September 1998 issue of Legends Sports Memorabilia Magazine was signed in blue by McGwire and includes a JSA sticker and COA.