Once one of the most valuable sports memorabilia items in the world, Mark McGwire's 70th home run ball from the 1998 season has plummeted in value over the subsequent 22 years. Per TMZ Sports, two ...
Former first baseman Mark McGwire finished with 583 career home runs in the 16 seasons he was in the league. Still, one of his former teammates believed he could have hit many more and broken the ...
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