Agnieszka Radwanska kicked off the defence of her Connecticut Open title with a hard fought win over Eugenie Bouchard.
It was a game of attack versus defence in New Haven and the renowned defensive skills of Radwanksa prevailed as she won 6-4 7-5, despite the Canadian hitting more winners throughout the match.
The win progresses the top seed to just her third quarter-final of the year and represents a good chance to head to New York for next week's US Open in the best shape possible.
Radwanska is 4/7 with Sky Bet to reach the semi-finals by seeing off 11/8 shot Shuai Peng in Thursday's last eight clash.
Carla Suarez Navarro was well on the way to victory over Jana Cepelova when the Slovakian retired while trailing 6-4 4-0 while Daria Gavrilova ousted Timea Babos 7-5 7-6 (8/6).
Elise Mertens beat Daria Kasatkina 6-2 7-5 and Shuai Peng made light work of Mirjana Lucic-Baroni in a 6-2 6-3 win.