Naomi Osaka's US Open title defence is over as she fell in the third round to a stunning performance by Canadian teenager Leylah Fernandez.

The 18-year-old Fernandez capitalised as Osaka lost her cool to craft a remarkable 5-7 7-6 (7-2) 6-4 victory.

The teenager could not contain her smile as she secured a fantastic win.

Osaka never regained her composure after she was broken in the second set, twice throwing her racquet to the floor as the tie-break flew away from her.

[Source: BBC]