Big Mac's 39th homer of 1999

Name: Big Mac's 39th homer of 1999
Uploaded: 1999-07-31
Duration: 1 min 12 s
Description: 7/31/99: Mark McGwire hits 39th home run of the season, his 16th in the month of July to set an NL record

Rockies @ Cardinals

July 31, 1999 | 00:01:12

7/31/99: Mark McGwire hits 39th home run of the season, his 16th in the month of July to set an NL record

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