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. I worked very hard, probably harder than ever.
As the second round got under way, there were delays-not for the first time-as rain storms passed over Toronto, but also news of the withdrawal of No3 seed Juan Martin del Potro with wrist problems.
Greece's Stefanos Tsitsipas set up a match against Djokovic, knocking off seventh-seeded Dominic Thiem of Austria, 6-3, 7-6 (6).
Haase beat Del Potro's replacement, Russia's Mikhail Youzhny, 7-5 6-2.
Denis Shapovalov of Canada also advanced to the second round, defeating No. 46 Jeremy Chardy of France 6-1, 6-4 in the night match on center court.
Anderson was too good for Ilya Ivashka 7-5 6-3, while Dimitrov overcame Frances Tiafoe 7-6 (7-1) 3-6 7-6 (7-4).
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"I thought it went really well out there", said Polansky, who's never made it past the second round of a Rogers Cup.
Nishikori, who reached the Washington quarter-finals last week and the last eight at Wimbledon, was overwhelmed by 11 aces from the Dutchman's racquet. Winning 1-6, 7-5, 7-5, it's great for me.
Kerber, from Germany wilted in the sticky heat at IGA Stadium in her first match since Wimbledon.
"I know how many friends wanted to come out today and how many fans were looking forward to seeing me on centre court this week", said Shapovalov, who grew up in nearby Richmond Hill, Ont. "I thought I served well in the moments when I really need it", Djokovic said. Every tournament starts from zero. That's what I needed, a match like this to be a little bit more confident and I did it".
Top-seeded Simona Halep of Romania trailed Anastasia Pavlyuchenkova of Russian Federation 4-3 when rain forced the suspension of play for the day.
He will play 14th-seeded Italian Fabio Fognini in the second round Wednesday afternoon.
U.S. Open champion Sloane Stephens, seeded third, routed local favorite Francoise Abanda 6-0, 6-2.
It was only the second time the two veteran players had met and the first in nine years. "And now that the tournament is here, it's like I have another priority". He's got a world-class backhand and matches like this are going to give him confidence.