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Olympic champion Dalilah Muhammad shatters 16-year 400m hurdles world record at US Championships
Christian Coleman blazes to victory at US championships; books place in World Championships
US Championships: Allyson Felix returns for her first 400m race in 13 months; Justin Gatlin, Christian Coleman jet through 100m heats
American triple-jumper Christian Taylor aims to play safe, won't go for medal at US championships and world trials in Iowa
