Canadian sensation Leylah Fernandez said she is pinching herself after continuing her fairytale run with a shock last-16 win over Angelique Kerber at the US Open.

After stunning defending champion Naomi Osaka in a third-round boilover at Flushing Meadows, giant-slaying teenager Fernandez conquered three-time grand slam winner Kerber 4-6 7-6 (7-5) 6-2 en route to the quarter-finals.

Kerber – the 2018 US Open champion – won the opening set in New York, however 18-year-old Fernandez staged a remarkable comeback on the eve of her 19th birthday to reach her first slam quarter-final.

"I did have to pinch myself a little bit to see that it actually happened, but like I said, I knew that my tennis, my level of tennis is there," Fernandez said post-match. "It's just a moment of time, opportunity, and I'm glad that I was able to get this opportunity now and that I was able to showcase what I can do in front of these players.

"Even if I would have lost, I would have been proud of myself with the way that I played, the way that I fought. I was lucky enough to get the win today and just getting this experience.

"It's my first fourth-round quarterfinals in a grand slam. I'm just going to enjoy it at 100 per cent, and tomorrow is going to be a new day."

Fernandez, who hit 45 winners to 34 unforced errors – added: "The match was incredible. I was playing well in the first set.

"Unfortunately I did a few mistakes. Her, as a great player, great champion, she noticed and she took advantage of it. I was able to refocus and fight back for the second.

"In the third, I was just enjoying every moment of it. Honestly, the crowd has been amazing, so thanks to them I was able to win."

"I'm just super happy," she continued. "I'm going to enjoy tonight as much as I can, and then once I'm off to bed, I'll try to forget about it so that I can get ready for tomorrow."