At Shea Stadium, the Mets and Cardinals split a doubleheader, with New York winning the opener, 8 – 7, and St. Louis taking the nightcap, 7 – 5. Mark McGwire hits two home runs in the first game, his 49th and 50th of the season. Number 49 breaks a light bulb in the scoreboard, 502 feet away. This gives him a major league record 50 or more home runs for four straight seasons.

This Day In Baseball

On August 22, 1999 — At Shea Stadium, the Mets and Cardinals split a doubleheader, with New York winning the opener, 8 – 7, and St. Louis taking the nightcap, 7 – 5. Mark McGwire hits two home runs in the first game, his 49th and 50th of the season. Number 49 breaks a light bulb in the scoreboard, 502 feet away. This gives him a major league record 50 or more home runs for four straight seasons.

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Sources:
Baseball Reference August 22
National Pastime August 22
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game