Other seeds winning in straight sets were No. 6 Anastasia Potapova of Russia, No. 7 Elina Avanesyan of Armenia and No. 8 ...

Mertens faced six break points but saved them all, while converting 5 of 8 opportunities to break Townsend's serve. Mertens moves on to face Germany's Tatjana Maria, who was a 2-6, 6-1, 6-2 winner ...