MOSCOW — In perhaps the most dominant performance to date at the 2013 IAAF World Championships, LaShawn Merritt crushed the field in the men’s 400 meters to lead a four-medal night for a surging Team USA Tuesday at Luzhniki Stadium. Nick Symmonds, Jenn Suhr and Tony McQuay all contributed silver medals to bring Team USA’s medal total to 10 (4 gold, 5 silver, 1 bronze).

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