Phelps broke the world record in the event for the seventh time, swimming a 1:52.03. It was his 10th career gold medal, the most in Olympic history, and his fourth of these Games. He remains on track to break the single-Olympic gold medal record of seven, owned by Mark Spitz.
The silver medal in Wednesday's race went to Laszlo Csch of Hungary and the bronze to Takeshi Matsuda of Japan.
Celebrity Families of 2014 [PHOTOS]