In earlier action, a solid-serving Novak Djokovic kept his bid for a fifth Rogers Cup title alive with a 6-3 6-4 win over Canadian wildcard Peter Polansky.
Djokovic was seeded ninth in Toronto. "With each game, with each point that I play, I feel more confident, more stable on the court, and everything falls into its place". "I thought I found pretty good accuracy and angles with the first serve, and also my second serve worked pretty well". "I'm pretty sure I'm making my family proud, all of those people that are watching, my coach, my father".
"He played very well and deserved to win without a doubt", Djokovic said.
"I've never played Basic".
Djokovic faded late against his flashy opponent, who played with poise and power on a warm, breezy afternoon at Aviva Centre.
Djokovic, a four-time Rogers Cup champion and former world No. 1, returned to the top 10 in mid-July after missing several months due to a right elbow injury.
"There were frustrations at times but that means I care". But I have to accept it, deal with it, and move on. "I just tried to stay focused".
Tsitsipas set up match point with a scorching crosscourt victor before completing the victory in their first career meeting in two hours 17 minutes.
"I knew he had some issues in some particular shots in his game, I would say".
"The main goal of the tweet was because I was disappointed, obviously not for myself, but because there was so many fans and friends that wanted to come watch me on centre court and they weren't able to", Shapovalov said.
"It's a dream of any kid out there in this world, any kid that's playing tennis, to beat these kinds of players, so I can call it the best moment of my life", a shocked Tsitsipas said. Nadal, playing his first event since losing to Djokovic in the Wimbledon semifinals, will face sixth-seeded Marin Cilic of Croatia. "I just need to use my chances as correct as possible and not hurry at all and just enjoy my time out playing in the center court, in such a handsome center court here in Toronto". "Just happy to be in the quarterfinals".
Upset scenarios were not in the plan of holder Alexander Zverev, who rolled over Russian Daniil Medvedev 6-3, 6-2 in just 52 minutes while never facing a break point.
There were first-round wins on Tuesday for 14th-seeded Italian Fabio Fognini, Sam Querrey, Ryan Harrison, Frances Tiafoe, Stefanos Tsitsipas, Karen Khachanov, Robin Haase, Canadian wild card Felix Auger Aliassime and qualifier Evgeny Donskoy. Obviously, back then, I think 2009, he was a little bit of a different player back then.