Sharapova ousted in Montreal
Maria Sharapova was eliminated from the Rogers Cup in Montreal on Thursday, beaten 6-2 4-6 6-2 by Carla Suarez Navarro.
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The 14th seed emerged victorious in the third-round clash despite a second-set fightback from Sharapova and a nerve-testing final-set rain delay.
The French Open champion was playing her first event since a surprise fourth-round exit at Wimbledon and has now suffered another setback ahead of the US Open.
Suarez Navarro raced through the first set and went a break up in the second, but Sharapova reeled off four straight games to level the match.
The Spaniard responded by edging ahead in the decider and although the rain break gave the underdog plenty of time to think about the situation, on the resumption Sharapova failed to mount a comeback.
Sharapova committed a grand total of 49 unforced errors during the match.
Another shock on Thursday saw second seed and newly-crowned Wimbledon champion Petra Kvitova beaten 6-4 1-6 6-2 by Ekaterina Makarova.
Kvitova, who like Sharapova has not played any competitive tennis since Wimbledon, paid the price for inconsistent play and will not be able to regain the title she won in 2012.
There were no such issues for top seed Serena Williams, who saw off 15th-seeded Czech Lucie Safarova 7-5 6-4.
Williams' sister Venus also advanced, the 34-year-old taking the notable scalp of sixth seed Angelique Kerber in another long battle that finished 6-3 3-6 6-4 to set up a clash with Suarez Navarro.
Another seed fell to an American opponent as rising star Coco Vandeweghe upset Jelena Jankovic 7-6 (10/8) 2-6 7-5.
Victoria Azarenka beat Britain's Heather Watson 6-2 6-4 while Caroline Wozniacki brushed aside American qualifier Shelby Rogers 6-1 6-0.
In the day's final match, third seed Agnieszka Radwanska beat Sabine Lisicki 6-1 3-6 6-3.