18-year-old Canadian, Shapovalov was nearly caught speechless after the biggest win of his career.
Federer is aware of the struggles that his great rival has overcome as he too was sidelined with a knee injury that saw him miss the final five months of the 2016 season.
Also Wednesday, 18-year-old Canadian Denis Shapovalov upset Juan Martin del Potro 6-3, 7-6 (4).
"I actually feel really happy because I know I can play a lot better". Yeah, it's tough to explain the emotions that were going through my head at that moment.
But if he beats Adrian Mannarino in the quarter-finals, Shapovalov could be ranked as high as No. 66 by the end of the week. The outburst appeared to steady the Swiss, whose serve and overall accuracy improved as the two-hour match progressed.
"I was just swinging for the fences", said the Canadian, who needed a wild card to get into the tournament.
Rafael Nadal kicked off his summer hard-court campaign with a bang, dismissing talented Croatian Borna Coric 6-1, 6-2 to reach the third round in Montreal. He brought the match to equal service in the ninth game before Ferrer rob him of the first inning after three errors in a row of the second head of series during the game subsequent. "I didn't today. I have another week in Cincinnati and then I have the Grand Slam coming". Great kid!He played a great match against RAFA in Montreal. He has everything to become a great player. Let's see. Let him make his career.
In Friday's quarterfinals, the second-seeded Federer will face 12th-seeded Roberto Bautista Agut of Spain, who outlasted Frenchman Gael Monfils 4-6, 7-6 (5), 7-6 (2) on center court at Uniprix Stadium. "He played with the right determination".
Elsewhere on Thursday, Roger Federer maintained his career-long winning streak over David Ferrer to advance to the last eight after a three-set battle with the veteran Spaniard.
Shapovalov isn't shy about taking heavy cuts at the ball and he showed a willingness to change direction in the opening set.
In other results, third-seed Dominic Thiem of Austria was upset 6-4, 6-7 (7), 7-5 by Argentina's Diego Schwartzman and Fifth-seeded Kei Nishikori of Japan, a finalist past year, was ousted 6-7 (4), 7-6 (7), 7-5 by Gael Monfils.
Germany's Alexander Zverev is also through after he beat Australian Nick Kyrgios 6-4, 6-3.
True, the Russian-born teenager (he was a one when his family moved to Canada) was lucky to escape four match points in his first-round contest against Rogerio Dutra Silva.
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