MONTRÉAL, Canada - Victoria Azarenka, Angelique Kerber and Caroline Wozniacki saw their second round matches carry over from Thursday due to rain; upon resumption two went as planned while the other never took the court.
The No.6-seeded Kerber had won the first set on Ekaterina Makarova, 6-3, but found herself at 1-3 when play was stopped Thursday night; however she came out strong on Friday, winning five games in a row to beat the Russian, 63 63.
Kerber recorded her WTA-leading 49th match win of a breakthrough season.
The No.7-seeded Wozniacki had rallied from a break down to take the first set against Kiki Bertens and was leading 75 40 when play was called, and upon resumption she completed her victory over the Dutch qualifier, 75 61.
Wozniacki is the only former Rogers Cup champion remaining, doing it in 2010.
Azarenka, the No.1-ranked player in the world and this week's No.1 seed, had a very different final result - the Belarusian was locked at 3-all in the first set against Tamira Paszek when play was called but that would be the end of it, as she had to retire from the match before resumption with a left knee injury.
Azarenka was coming off a strong showing at the Olympics, where she won the bronze medal in singles plus gold in doubles alongside countryman Max Mirnyi.
"There are a few reasons," Azarenka told reporters in a press conference. "The last week took so much energy out of me that I had absolutely no time to recover, and my body is feeling it. It was a little bit too quick of a transition for me to come and start the training, and I felt my knee just wasn't in good shape.
"It's unfortunate because I was really looking forward to playing here. I have really enjoyed being here. I tried yesterday and today it just got worse. I can't see the point of continuing to play if I can't give even 50% of my game.
"I hope it's a short-term thing. I have to just stop and take a little bit of time off because I had absolutely no rest for a long period of time. I just need to settle it down and go from there. Hopefully there's nothing serious about it."
Azarenka was asked if she thought it might affect other tournaments coming up.
"If I cannot play here, there is no chance for me to play anywhere else. My first goal is to get healthy and make sure I'm 100% ready to play the US Open."
Though it may not have come the way she wanted it to, Paszek got her second career win over a reigning World No.1, her first coming right here four years ago in 2008 - that year she beat then-No.1 Ana Ivanovic in the third round.