Chase Kalisz has won the first American medal of the Tokyo Games, taking gold Sunday in the men’s 400-meter individual medley. Jay Litherland made it a 1-2 finish for the powerhouse U.S. team, rallying on the freestyle leg to take the silver. Brendon Smith of Australia claimed the bronze. Kalisz, a protege and former training partner of Olympic great Michael Phelps, touched first in 4 minutes, 9.42 seconds. Litherland was next in 4:10.28, just ahead of Smith (4:10.38).