Williams smashes Stosur
World number one Serena Williams smashed 10 aces as she wiped the floor with Samantha Stosur in the second round of the Rogers Cup in Montreal.
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The 32-year-old American was in a hurry as she ruthlessly dispatched Stosur 6-0 6-2 in just under 59 minutes.
Williams, who faces Lucie Safarova next, did not even let Stosur rack up a single break point against her serve.
Earlier in the day, Maria Sharapova overcame a scare against Garbine Muguruza before coming back to maintain her 100 per cent record against the Spaniard.
The world number six made seven double faults as she lost the first set, before storming back to win 4-6 6-3 6-1 after just over two hours.
She will now face Carla Suarez Navarro in the next round after the 25-year-old beat Karolina Pliskova 6-1 3-6 6-3.
British number one Heather Watson bridged a 45-place gap in the singles rankings to upset Dominika Cibulkova 6-2 6-7 (3/7) 7-6 (7/5) and book a meeting with Victoria Azarenka.
The 22-year-old flew out of the blocks in the opening set, with her serve causing constant problems, before the world number 12 found some form to make it a contest but Watson just had enough to get over the line in the deciding tie-break.
German Sabine Lisicki also had to dig deep to beat Madison Keys 4-6 6-1 6-4 to set up a clash with world number five Agnieszka Radwanska.
But it was much simpler for 11th seed Caroline Wozniacki, who will face world number 113 Shelby Rogers next, after she completed a routine 6-1 6-2 victory over Klara Koukalova.
Elsewhere, Jelena Jankovic squeezed past Sloane Stephens 6-7 (7/9) 6-4 7-6 (7/4), Angelique Kerber overcame Caroline Garcia 6-4 6-1 and Ekaterina Makarova made no mistakes against fellow Russian Elena Vesnina, winning 6-3 6-2.
Second seed Petra Kvitova raced to a 6-3 6-2 success over Australia's Casey Dellacqua, while Venus Williams joined her sister in the next round thanks to a 6-3 6-2 win over Yulia Putintseva, a qualifier from Kazakhstan.
But ninth-seeded Serbian Ana Ivanovic crashed out, American qualifier Coco Vandeweghe claiming a 6-7 (7/9) 7-6 (9/7) 6-4 win.