Second seeded Agnieszka Radwanska of Poland rallied past German Mona Barthel with 4-6, 6-3, 7-6 (5) scoreline in the second round match of Rogers Cup in Montreal.

Radwanska first won the second set to level the set scores at 1-1 and then came from a break down in the final set to the match in a tie breaker.

Radwanska next plays Chanelle Scheepers of South Africa for a place in the quarter-finals.

Tenth seeded Li Na of China defeated Canadian Eugenie Bouchard 6-4 6-4 in straight sets.

Li Na said "It's really tough. I think I was warming up like a hundred times. You never know when you can come to court, so you always have to ... stand up every second."

Top seeded Victoria Azarenka of Belarus will finish her match against Tamira Paszek on Friday after it was postponed due to rain.