Canada's Milos Raonic advanced to the quarter-finals at Wimbledon with a 4-6, 6-1, 7-6, 6-3 win over Japan's Kei Nishikori on Tuesday.

Raonic, from Thornhill, Ont., is the first Canadian men's singles player in tennis' Open era to reach the quarters at Wimbledon.

His next opponent is unseeded Aussie Nick Kyrgios, who upset No. 2 seed and two-time champion Rafael Nadal 7-6 (5), 5-7, 7-6 (5), 6-3 in their fourth-round match.

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Milos Raonic plays a shot during Tuesday's fourth-round match at Wimbledon. (Jan Kruger/Getty Images)

Canada's Eugenie Bouchard advanced Monday to the quarter-finals of the women's singles tournament, becoming the first Canadian in the Open era (since 1968) to accomplish that feat.

Raonic, 23, laid down 34 aces in his victory over Nishikori. Raonic broke three times, saved five break points against his serve and ended with 64 winners in the comprehensive victory.

Nishikori had won his previous two matches against Raonic.

Nadal ran out of comebacks, losing to a brash, big-serving, between-the-legs-hitting 19-year-old kid who might just be a future star.

Maria Sharapova, somehow, seemed on the verge of a turnaround despite a flurry of unforced errors, saving six match points before finally succumbing on the seventh with — what else? — a missed shot.

And in the most striking sight of a memorable day of departures by past Wimbledon champions, Serena Williams couldn't get the ball over the net in a doubles match with her sister Venus, stopping after three games because of what was called a viral illness.

All in all, Tuesday was chock-full of significant events and the most noteworthy winner had to be 144th-ranked Nick Kyrgios of Australia, who used 37 aces and a have-no-fear approach to beat Nadal 7-6 (5), 5-7, 7-6 (5), 6-3 for a quarterfinal berth.

"I was in a bit of a zone out there," said Kyrgios, the lowest-ranked player to beat the No. 1 man at any Grand Slam tournament in 22 years.

"You've got to believe you can win the match from the very start, and I definitely thought that," the 6-foot-4 Kyrgios said. "I'm playing some unbelievable tennis on the grass."

That's for sure.

Playing in only his fifth major tournament — he got into the field thanks to a wild-card invitation — Kyrgios is the first man to reach the quarterfinals in his Wimbledon debut in 10 years. He's also the first teenager to defeat the top-ranked man at a Slam since Nadal was 19 when he beat Roger Federer at the 2005 French Open.

"We keep saying, 'Who's the next guy?' And I think we may have found him," seven-time major champion John McEnroe said on the BBC broadcast.

Nadal dropped the first set in each of his previous three matches before coming back to win. When he took the second set Tuesday, though, Kyrgios stayed steady.

"Kyrgios is young; he has nothing to lose," said Nadal's uncle and coach, Toni "It's like when Boris Becker won here. He was 17 and had a very good serve. He could beat everyone because of his serve. It's the same with Kyrgios. He plays aggressively and without any doubts."

For Nadal, who won Wimbledon in 2008 and 2010, it was yet another early exit at the grass-court tournament against a much-lower-ranked opponent. In 2012, he lost in the second round against No. 100 Lukas Rosol. Last year, he was beaten in the first round by No. 135 Steve Darcis. Neither of those players is considered an up-and-coming contender like Kyrgios is, but the common thread among the trio was going for broke.

"The thing is, [on] this surface, when you have an opponent that decides to serve and to hit every ball very strong, you are in trouble," Nadal said.

Kyrgios, who saved nine match points while beating 13th-seeded Richard Gasquet in the second round, showed zero hint of nerves. Indeed, he soaked up all the attention and adoration offered by the Centre Court crowd, particularly after an audacious trick shot: Facing the net at the baseline, he whipped his racket around his back and casually flicked a shot that sailed between his legs and over the net for a winner.

He joked about reading that his mother said she didn't think he could beat Nadal.

"It actually made me a bit angry," Kyrgios said, then noted: "I'll just text her a smiley face."

Quarter-finals set

On Wednesday, Kyrgios faces Raonic, another man never before this far at Wimbledon. The other men's quarter-finals: seven-time Wimbledon champion Roger Federer against good friend and Australian Open champion Stan Wawrinka in an all-Swiss matchup; defending champion Andy Murray against No. 11 Grigor Dimitrov; and 2011 champion Novak Djokovic against No. 26 Marin Cilic.

The women's quarter-finals Wednesday: No. 3 Simona Halep against 2013 runner-up Sabine Lisicki, and No. 9 Angelique Kerber against No. 13 Eugenie Bouchard. The semifinal on the other side of the draw was established Tuesday: 2011 champion Petra Kvitova against No. 23 Lucie Safarova.

Kerber edged Sharapova 7-6 (4), 4-6, 6-4 Tuesday. Sharapova made 49 unforced errors, 38 more than Kerber. Still, the 2004 champion saved one match point at 5-2 in the final set, then five more at 5-4, before pushing a backhand long to end it.

"I felt like I worked too hard within the match to let it go the easy way. So I did everything I could in the end to try to save those," Sharapova said. "I did, but I didn't save the last one."

Canadians advance in doubles

In men's doubles, veteran Daniel Nestor of Toronto and Serbian partner Nenad Zimonjic finished off a rain-delayed match from Monday as the third seeds reached the quarter-finals over Pablo Cuevas of Uruguay and David Marrero of Spain 7-6 (8), 6-4, 6-4.

Vancouver's Vasek Pospisil and American Jack Sock reached the third round over India's Rohan Bopanna and Aisam Quereshi of Pakistan 6-7 (3), 7-6 (5), 6-3, 7-5.

With files from The Associated Press