Montreal - Sabine Lisicki upset 13th-seeded Sara Errani 6-1, 7-5 in the first round of the Rogers Cup on Monday.
Errani, the 2012 French Open runner-up, is most comfortable on clay, while the 29th-ranked Lisicki likes the faster surfaces.
Lisicki, the 2013 Wimbledon runner-up, hit the fastest recorded serve in WTA history (131 mph) last week at Stanford.
Errani was serving for the second set at 5-3 but let the lead slip away. Lisicki next plays Svetlana Kuznetsova or Madison Keys.
Barbora Zahlavova Strycova beat Roberta Vinci 7-5, 7-5. Zahlavova Strycova will face third-seeded Agnieszka Radwanska.