Seeds went 4-0 Tuesday in Toronto with former champions Caroline Wozniacki and Agnieszka Radwanska both advancing along with Elina Svitolina and Elena Vesnina.
Wozniacki rolled past qualifier Ekaterina Alexandrova 6-3, 6-0.
“It was a pretty good match. I kind of got to find my rhythm in the beginning but thought I served and returned very well,” Wozniacki said. “Once I got going, I kind of started to play better. It’s always nice to get a nice win in two sets in the first round, so I’m very pleased with that.”
Wozniacki won Montreal in 2010, but had never won a match in Toronto until Tuesday.
“It’s really crazy that I hadn’t won a match here before today,” she added. “I’m definitely very pleased and was a little bit nervous serving it out. I was like, ‘Please, let me get this one’ and I managed to.”
Radwanska, the 2014 winner, ousted Stanford champ Coco Vandeweghe 6-3, 6-2. Radwanska recently married hitting partner Dawid Celt.
“It was a great weekend. It didn’t change any of my plans, but I’m obviously very happy that Caro and Angie could come,” Radwanska said. “I couldn’t imagine a wedding without them. I’m happy all the Polish players were there as well.
“I had a really good wedding planner, so I can thank her for doing everything for me. I didn’t have to do much. I got to wear sneakers at the end of the wedding, so I went from high heels, then lower and lower, to finally running shoes.”
Elina Svitolina beat Daria Kasatina 7-6(4), 6-4 while Elena Vesnina was a first round victor over Alison Riske.
Canadian hope Eugenie Bouchard was promptly bounced by qualifier Donna Vekic 6-3, 6-4. Bouchard has won just one of her last six matches.
“Tough match in singles,” Bouchard said. “I think I just made too many unforced errors, you know. I’m obviously a bit low in confidence right now. So it’s tough to get through tough matches when you’re in a moment like that.
On Wednesday, Karolina Pliskova, Simona Halep, Venus Williams, Angelique Kerber and Wimbledon champion Garbine Muguruza are all in action.
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