Leylah Fernandez looks like she's here to stay.
The unseeded Canadian 18-year-old who shocked the world by eliminating Naomi Osaka from the US Open followed up that upset by defeating the tournament's 2016 champion Angelique Kerber 4-6, 7-6, 6-2 on Sunday.
Fernandez opened the match by going up a break in the first set, but proceeded to lose four straight games to drop the set and fell behind 3-1 in the second set. At that point, rather than fold, Fernandez hit another gear. She won 11 of the next 16 games, never dropping a service set again.