There's just no contest: Michael Phelps is the greatest Olympian of all time. He's racked up 26 medals (22 of them gold) and shattered world records. He's gone into retirement and come back out. And now, at age 31, he's still dominating the competition in the pool.
In fact, last night, Phelps broke the world record for most individual gold medals won by a single Olympian - a record held for 2,160 years by ancient Greek runner Leonidas of Rhodes.
Here's a look at Phelps' awe-inspiring career.