The 18-year-old Shapovalov won the biggest match of his career, battled back from dropping the first set in 38 minutes before outlasting Nadal in a third-set tiebreaker.
Nadal would have returned to No. 1 in the world if he had defeated Shapovalov Thursday, and then Chung Hyeon or Adrian Mannarino on Friday. "Is win-win for him", said Nadal, who needed to reach the semifinals here to reclaim the No. 1 spot in the rankings.
Shapovalov faced six break points in the third set, each feeling like a match point as Nadal would only need to hold his own service games to win the match from there. Nadal took a 6-1 6-2 to avenge the thrashing Coric inflicted on him previous year in OH and move into the second round. However, just when the draw benefitted 15-time Grand Slam champion greatly, the Canadian was able to produce the performance of his life as he managed to clinch the upset after a marathon 2 hours and 49 minutes of play.
Polansky, ranked No. 116 in the world after some strong results in challenger events, upset No. 75 Vasek Pospisil of Canada in the first round on Monday. However, here he beat Brazil's Rogerio Dutra Silva in the opening round, followed it up with another win over Juan Martin Del Potro in the second before finally scalping Nadal. Federer said if it's a two-way race between Rafa and him and he hopes to be him as it means a lot of him to get back at No 1.
18-year-old Canadian, Shapovalov was nearly caught speechless after the biggest win of his career.
"Denis played well, he has great potential and I wish him all the best". "I played really well in the big moments". "I remember when he was injured a year ago, and here he is a few matches away from clinching world No 1".
Elsewhere Wednesday, France's Gael Monfils saved four match points before digging deep to defeat Japanese fifth seed Kei Nishikori in an attritional three-set duel.
Robin Haase saw off Ernesto Escobedo 6-4 6-1 while Roberto Bautista Agut was a 7-5 6-2 victor against Ryan Harrison.
In Toronto, World No. 1 Pliskova advanced to the quarterfinals of the WTA Toronto hardcourt tournament while a pair of high seeds Venus Williams and Angelique Kerber crashed out in straight sets.
He also rued his missed opportunities in the final set, having wasted a massive amount of five break points in his first three return games of the decider.
Germany's Alexander Zverev is also through after he beat Australian Nick Kyrgios 6-4, 6-3.
Pliskova is to move on to play sixth-seeded Caroline Wozniacki of Denmark, who defeated 10th-seeded Agnieszka Radwanska of Poland 6-3, 6-1. Shapovalov grabbed the momentum and worked his way to a pair of match points.
It was the first time the Frenchman had come from a set down against a top-10 opponent in seven years.
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