LONDON — Another night, another four medals for Team USATF at the IAAF World Championships Saturday night at Queen Elizabeth Olympic Park Stadium. A gold from the women’s 4×100, silver from the men’s relay and Dawn Harper-Nelson in the 100 hurdles, and bronze for Paul Chelimo in the men’s 5,000 meters brought Team USATF’s medal tally to 27 medals with one day of competition remaining.