American hurdler Sydney McLaughlin won the women’s 400-meter hurdles on Aug. 4 at the Tokyo Olympics in world-record time. McLaughlin finished in 51.46 seconds, almost a half-second faster than her previous world mark, set during the U.S. Olympic Trials in June. “I’m absolutely delighted. What a great race. I’m just grateful to be out here celebrating that extraordinary race and representing my country,” the 21-year-old from New Jersey said. Second place also was taken by Team USA, as defending Olympic champion Dalilah Muhammad finished her sensational run with a personal best of 51.58 seconds. Muhammad, a 31-year-old New York City native and former world record holder with a time of 52.16 seconds, won gold in the 2016 Olympics in Rio de Janeiro and was attempting to become the first woman to repeat as champion in the 400-meter hurdles. “No mixed emotions,” she said. “Sure, there are always things you want …