British qualifier Heather Watson upset 12th-ranked Dominika Cibulkova 6-2, 6-7 (3), 7-6 (5) Wednesday in the second round of the Rogers Cup.
Watson let a 5-2 lead slip away in the third set before rallying. The 22-year-old will face No. 11 Victoria Azarenka in the third round on Thursday.
No. 13 Caroline Wozniacki cruised past Klara Koukalova 6-1, 6-2 and will meet American qualifier Shelby Rogers in the third round. Rogers had upset eighth-ranked Canadian Eugenie Bouchard 6-0, 2-6, 6-0 on Tuesday.
Angelique Kerber ousted Caroline Garcia 6-4, 6-1.
Top-ranked Serena Williams will face No. 21 Samantha Stosur later Wednesday.