SOLD: The most expensive sports memorabilia to be auctioned off

[post_page_title]Mark McGwire’s 70 home run ball[/post_page_title]
At the time when Mark McGwire knocked this ball out of the park, it set the record for the most home runs in a single season. Seventy homers in one year, nine more than the previous record. The ball that McGwire hit deep to left field on that day in September 1988 sold for $3 million. Of course, three years later his record was smashed by Barry Bonds, who hit 73, and McGwire’s career will always be overshadowed by PED use.