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.
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