The title of Fastest Man Alive has been held by world-record holder Usain Bolt, who grabbed his third straight gold medal in the men's 100m. That's something no one has ever done in the 100m. In fact, the only other person to have three medals of any kind is American Justin Gatlin, who took silver on Sunday.
"I expected better, to tell you the truth," Bolt told NBC after the race. His time of 9.81 was the slowest of his three gold medal races. But he's still a superhuman who probably shouldn't be as fast as he is.