Adam Greenberg, right, and Miami Marlins general manager Michael Hill shake hands after Greenberg signed a one-day contract before a baseball game against the New York Mets in Miami, Tuesday, Oct. 2, 2012. Greenberg was beaned in his debut for the Chicago Cubs in 2005. He never made it to the big leagues again. Until now, at 31. (AP Photo/Alan Diaz)

Associated Press
Adam Greenberg, right, and Miami Marlins general manager Michael Hill shake hands after Greenberg signed a one-day contract before a baseball game against the New York Mets in Miami, Tuesday, Oct. 2, 2012. Greenberg was beaned in his debut for the Chicago Cubs in 2005. He never made it to the big leagues again. Until now, at 31. (AP Photo/Alan Diaz)
Adam Greenberg, right, and Miami Marlins general manager Michael Hill shake hands after Greenberg signed a one-day contract before a baseball game against the New York Mets in Miami, Tuesday, Oct. 2, 2012. Greenberg was beaned in his debut for the Chicago Cubs in 2005. He never made it to the big leagues again. Until now, at 31. (AP Photo/Alan Diaz)
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