From swimmer Ryan Lochte to gymnast Gabby Douglas, see which Olympians will be vying for the gold in London this summer
Michael Phelps: Swimming
Credit: Streeter Lecka/Getty Images
Ready to retire: After two decades, the 16-time medalist (three away from being the most decorated Olympian ever!) is eager to hang up his goggles at the end of the Games. Says Phelps, "I've known swimming and that's it. I'm looking forward to what comes next."