Mark McGwire's Three-Home-Run Game, 1998

Mark McGwire hit three home runs in one game for the St. Louis Cardinals against the Arizona Diamondbacks on April 14, 1998. The St. Louis Cardinals won 15–5.

The game was played at Busch Stadium II in St. Louis. The announced attendance was 31,477. The game took 2h 51m. It was a night game under sunny skies, at 75 degrees.

Mark McGwire did it five times in all. Jeff Suppan started for the Arizona Diamondbacks. Gerry Davis umpired behind the plate. It is the third of eleven three-home-run games the archive records that season.