On Friday, the internet was all abuzz with Serena Williams. Yes, she beat Maria Sharapova 6-1, 6-3 in a Madrid Open quarterfinal. But the real news was the leak from an apparently forthcoming rap track. The tennis star is just the latest athlete to get behind the mic – joining the ranks of boxer Manny Pacquiao, basketball great Shaquille O’Neal and even the ‘86 Mets. Today, NPR sports correspondent Mike Pesca joins us for a look back at what happens when athletes get into the music game.