Leylah Fernandez is a self-described happy-go-lucky girl having the time of her life at Flushing Meadows, raising her fists, pumping her arms and riling up crowds while beating two past US Open champions to reach her first Grand Slam quarter-final.

A day before her 19th birthday, the unseeded left-hander from Canada grabbed the last five games to eliminate 2016 title winner Angelique Kerber 4-6, 7-6, 6-2 on Sunday, demonstrating that an earlier upset of defending champion Naomi Osaka was certainly no fluke.