Fifth-seeded Berdych rallied to beat Borna Coric 4-6, 6-1, 6-4 earlier Tuesday, happy to overcome his early break after a bye in the first round.

"I mean it was by my mistakes and then it was just basically trying to get used to the conditions because they were quite different," Berdych said. "I was just really trying to be patient with myself. Trying also to look for the opportunities. And that's what paid off."

Gael Monfils had a 6-3, 6-3 win over Joao Sousa in his first-round match.

Taiwan's Lu Yen-Hsun admits he's a bit nervous about facing hometown star Milos Raonic on Wednesday, but he's banking on the fourth-seeded Canadian having a few butterflies, too, in his first match since losing the Wimbledon final.

Lu, who advanced to the second round with a 7-5, 6-3 victory over Alexander Zverev of Germany, will have few backers among the expected capacity crowd at the 12,500-seat Aviva Centre.

"All the spectators against you is very tough," Lu said. "But, I mean, this is what he should get because he comes from the country and he's one of the best players right now."

Canada's Vasek Pospisil defeated Jeremy Chardy in first-round action after the Frenchman retired with a right foot injury.

Pospisil, who won the first set 7-6 (3) and was leading 30-0 in the first game of the second set, will next face Monfils.

In men's doubles action, Canadian pair Philip Bester and Adil Shamasdin upset Novak Djokovic, the singles No. 1, and Nenad Zimonjic 7-5, 4-6, 10-2.