Marketa Vondrousova of the Czech Republic hits a return against Caroline Wozniacki of Denmark during their Canadian Open match at Stade IGA on Wednesday. MONTREAL: World number one Iga Swiatek overcame an early test before running away with a 7-6(6) 6-2 victory over Czech Karolina Pliskova in Montreal on Wednesday to reach the third round of the Canadian Open. Swiatek was locked in a battle early against former world number one Pliskova but managed to stay in the match by winning most of the long rallies while displaying both a lethal forehand and solid court coverage. Swiatek faced plenty of resistance from Pliskova in the hour-long first set but managed to come back from 5-4 down to force a tiebreaker where she again had to come from behind before sealing it when the Czech sent a forehand wide. In the second set, Swiatek found a new gear and followed an early break with a hold to love to grab control and never looked back as her mix of power and control proved to much for Pliskova to overcome. While serving for the match, Swiatek handed a break to Pliskova with her first double fault of the set, but the Pole immediately broke back in the next game to seal the win. Up next for four-time Grand Slam champion Swiatek, who will launch the defense of her U.S. Open title later this month, will be Karolina Muchova, who she beat in this year’s French Open final. Wozniacki stopped: Wimbledon champion Marketa Vondrousova ended Caroline Wozniacki’s first tournament back after a more than three-year break from competitive tennis with a 6-2 7-5 victory to reach the third round. Qualifier Danielle Collins backed up a first-round win over Elina Svitolina with a 6-4 6-2 takedown of eighth seed Maria Sakkari for the biggest upset of the tournament. The resurgent American will next face Leylah Fernandez after the 20-year-old Canadian earned a grueling 7-5 5-7 6-3 victory over Beatriz Haddad Maia to reach the round of 16. Second seed Aryna Sabalenka erased a second set deficit to beat Petra Martic 6-3 7-6(5) under the lights in her first match of the hard-court swing. The hard-hitting Belarusian will next face Liudmila Samsonova in the third round of a tournament where she has an opportunity to take over the world number one ranking for the first time. Among other seeded players in early action, Jessica Pegula, Gauff and Liudmila Samsonova enjoyed straight-set victories to reach the third round while Belinda Bencic advanced with a 6-3 5-7 6-4 win over Alycia Parks. Third seed Elena Rybakina completed her rain-interrupted match, which began on Tuesday night, with a 6-7(3) 7-6(5) 6-3 win over American Jennifer Brady on Wednesday.