Samantha Stosur has been eliminated by Russian world number 40 Daria Gavrilova in the first round of the WTA Rogers Cup in Toronto.
The 18th ranked Stosur was in good form reaching the semi-finals of the Washington Open last week but could not reproduce that in Toronto losing 6-4, 6-4 to Gavrilova. Stosur made just 59 per cent of her first serves compared to 73 per cent for Gavrilova. Gavrilova, who now calls Melbourne home and represents Australia at majors, will take on seventh seed Lucie Safarova in the second round. World number one Serena Williams is through to the third round of the event after defeating Italy's Flavia Pennetta 2-6, 6-3, 6-0. It was the 725th career match triumph for Williams, who withdrew from last week's Stanford Classic in California with a right elbow injury. Williams connected on only 44 percent of her first serves, won just 7 of 12 first serve points and only 2 of 15 on her second serve. She was broken four times, twice more than Pennetta. She became the only player to reach the third round at the US Open hardcourt tune-up event thanks to rain that washed out all but two matches on the first day. Williams hopes to win in Toronto for a third time in a row after 2011 and 2013 titles in the Canadian event, which exchanges venues every year with the men's event being played this week in Montreal. In other first round results Alize Cornet of France beat ninth seed Carla Suarez Navarro of Spain while 10th seed Karolina Plishkova of the Czech Republic fell to Mirjana Lucic-Baroni of Croatia. American Alison Riske outlasted 12th seed Timea Bacsinszky of Switzerland 3-6, 7-6(7/4), 7-6(7/3) in a three-hour marathon.