Mark McGwire's Opening Day grand slam in 1998

Opening Day Slam Historical Marker

McGwire's Opening Day grand slam, 03/31/1998

Debating the swings — and misses — from 'Long Gone Summer,' ESPN's documentary on the Sammy Sosa-Mark McGwire home run race of 1998 – The Virginian-Pilot

Vintage Chicago Tribune: 'Summer of Sammy' Sosa home run race of 1998

Why the 1998 MLB season was the greatest ever - Sports Illustrated Vault

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Cardinals' best Opening Day moments

2014 Hall of Fame profile: Mark McGwire

Mark McGwire grand slam lifts Cardinals to season-opening win in 1998

Mark McGwire's 62nd HR made him, temporarily, an American hero - Sports Illustrated Vault

Looking Back At The 1998 Home Run Chase – Hartford Courant