NEW HAVEN, Connecticut Aug 20 Former world number one Amelie Mauresmo saved a match point before beating fifth seed Patty Schnyder 6-4 3-6 7-6 to reach the quarter-finals of the WTA event in New Haven on Wednesday.
The Frenchwoman, looking to climb the rankings from 33rd after an injury-hit year, pushed hard in the final set to continue her recent revival.
"Even if I had lost today I think I would have been pretty satisfied with my performance, if a bit disappointed," Mauresmo told reporters.
"These are the kind of matches I have been losing in the last year. At some point it affects your confidence, so to win one like this is good and hopefully I can build from here."
Mauresmo led 4-2 in the final set but Schnyder broke twice and served for the match at 5-4 only for two double-faults to hand Mauresmo a lifeline.
The Swiss then led 6-5 in the tiebreak but could not convert a forehand pass and two points later, netted a backhand to give the twice grand slam winner victory after two hours nine minutes.
Mauresmo will now play fourth seed and last year's runner-up Agnes Szavay of Hungary.
Top seed Anna Chakvetadze booked her place in the last eight after a routine 6-4 6-4 win over Australian Casey Dellacqua.
"I didn't play any matches for two weeks and I had never played her before so didn't know what to expect," Chakvetadze said.
"But it was ok. I lost my rhythm a bit on my serve but I fought to the end and I am very pleased with the win."
Caroline Wozniacki also advanced to the last eight, while second seed Daniela Hantuchova is in action later on Wednesday.
In the men's event, fourth seed Igor Andreev of Russia reached the quarter-finals with a 6-4 7-5 win over Romanian Victor Hanescu.
Sixth seed Marin Cilic of Croatia and number seven Andreas Seppi also reached the last eight.
Top seed Fernando Verdasco and second seed Ivo Karlovic are in action later on Wednesday. (Editing by Clare Lovell)