800m
The American hit the headlines in 2019 when she ran the second-fastest indoor 600m time in history with 1:23.57 in New York and this year has seen Mu continue to light up indoor tracks on the US collegiate circuit. First she stormed to a time of 50.52 for 400m before she broke the world U20 indoor 800m record with 1:58.40 in February.
The second youngest of seven siblings, Mu has her brothers to thank for getting her involved in the sport as she would watch them running and soon joined in herself. The 18-year-old has already transferred her impressive indoor form to the outdoor season and ran a world-leading 1:57.73 to better the North American U20 record time in Texas last month.
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