Former World No.1 Venus Williams and Karolina Pliskova managed to grab their wins before the rain came down and cancelled the rest of the day, including the first clash between Sharapova and Karatancheva since 2010, interrupted with the Russian leading 4-1.
Venus looked uncomfortable, showing apparently the signs of recurring right knee pain, but managed to come back from a break down and defeat fellow American Caroline Dolehide 7-5, 6-1. Dolehide, one of the two teenagers in the main draw, was leading by a set against World No.1 Simona Halep at the BNP Paribas Open, and for four games she dreamt to clinch her maiden top 20 win against the 2014 finalist.
Experience made the difference as Venus took a 5-0 lead in the second set and progress to the second round against Sorana Cirstea or Monica Niculescu, two of the six Romanian in the draw, making Romania the most represented nation alongside Czech Republic Making her ninth appearance at Rogers Cup, the oldest player in the draw lost her opening match at this event on five occasions at Rogers Cup, most recently to Lisicki in 2015.
Delivering more efficient crosscourt backhands and profiting from Dolehide's inconsistencies, Venus avoided her worst-by-ranking defeat since being upset by No.223 Peng at 2016 Beijing, and completed her 461st career win on hard courts as she reinforcec the third highest winning percentage on this surface (.776) behind Serena Williams (.861) and Sharapova (.782) among active players.
A brief delay as a lines official fell ill in the sixth game of the second set didn't change the outcome as Venus Williams played far more consistently with 12 winners to her opponent's 11 and just 16 unforced errors to 25.
In her first hardcourt match after Wimbledon, former World No.1 Karolina Pliskova met a familiar face, Katerina Siniakova who practice in her same club. The No.9 seed won five straight games from 4-4 in the opening set to produce a 6-4, 6-4 win to move to the second round as she drilled 28 winners to 26 unforced errors.
In her fifth Canadian campaign, seeded for the fourth consecutive occasion, Pliskova completed her ninth victory in her last 10 matches against compatriots in her bid to equal last year's quarter-finals run (l. Wozniacki).
Aiming for her seventh hardcourt title, Pliskova could next have a Wimbledon rematch on the rise, as she will face the winner of the match between Kiki Bertens and wildcard Carol Zhao. The Czech is playing her first WTA event after she wed Hrdlicka after Wimbledon.
"It was very small wedding. There was not many people, not many things what we had to plan or what we have to do" WTAtennis.com quoted her to say. "Actually I wanted to share it by myself, but there were some Czech newspapers, they found out.
It was not like really from my side that I would put it first on Instagram or somewhere. I think my personal life is important for me, also for my career". No.10 seed Julia Goerges extended to 12-2 her tiebreak record completing an emphatic comeback to see off Timea Babos in three sets, 3-6 7-6(3) 6-4.
Definitely inconsistent off both sides in the opening set, she hit 17 aces to reinforce her seasonal lead at 335. Seeded for the first time here, she struck 44 winners, 33 unforced errors to equal her best results, the second round showings in 2011 (l.
eventual champion S.Williams) and 2015 (as a lucly loser, l. A.Radwanska). The German will take on for the sixth time former World No.5 and Czech qualifier Lucie Safarova, who saved a match point to defeat Daria Gavrilova in three sets.
Forced to play the qualifying rounds for the first time since 2009 Rogers Cup, the former semifinalist reeled off five straight games to come back from 2-5 down in the third set to stage a 4-6 6-4 7-5 win in two hours and 35 minutes.