South Africa, the U.S., Canada, Great Britain and Spain each won 4x100m or 4x400m titles at the World Athletics Relays in Guangzhou, China. The U.S. victory came in the mixed-gender 4x400m with Chris Robinson,

Canada has won the first ever World Relays mixed 4x100-meter title in Guangzhou, China. The Canadian team of Sade McCreath, Marie-Eloise Leclair, Duan Asemota and Eliezer Adjibi finished ahead of Jamaica and Britain as the event was debuted at the World Athletics Relays.

Canada produced a sublime display in ideal sprinting conditions to outclass Jamaica and Britain en route to the inaugural mixed 4x100 metres relay gold on the final day of the World Athletics Relays on Sunday.