Leon Marchand of France, who trains at Arizona State University, and Chase Kalisz of the U.S. were well out front during the men's 400m individual medley at the Pro Swim Series event in San Antonio, with Marchand out-touching Kalisz by more than a second.

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Leon Marchand outpaces Chase Kalisz in 400m IM at Pro Swim Series San Antonio | NBC Sports

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