Second seed Eugenie Bouchard has reached a European clay quarter-final for the second time in her career after the Canadian defeated Yaroslava Shvedova 6-4 6-2 at the ATP-WTA Portugal Open.

The 20-year-old debutante at the Jamor Sports Complex, ranked 18th, won the last four games of the opening set from 2-4 down and had to keep up the fight in the second set to ease past the 65th-ranked Kazakh in their first-time meeting on Wednesday.

Bouchard played a clay semi-final at Strasbourg in 2013 and also reached the semi-finals on American green clay three weeks ago in Charleston, a completely different surface.

She saved seven of nine break points against her serve, broke five times and benefited from six double-faults from Shvedova in 87 minutes on court.

The final game of the opening set was a marathon, comprising seven deuces.

“I just tried to stay positive and get through it,” Bouchard said.

“I began playing more steady in the second set. It’s important to control the points against her big shots.”

Italian fourth seed Roberta Vinci showed lethal form, winning the first 10 games in a 6-0 6-2 hammering of 2009 titleholder Yanina Wickmayer of Belgium.

It was the sixth straight win for Vinci over Wickmayer, who last beat her in 2010 on hardcourt.

“The match score might have looked easy but it was tough on court,” Vinci said.

“We had difficult conditions with the wind, but I played well. I was focused and she was making a lot of errors.”

Swiss qualifier Timea Bacsinszky, ranked 165th, continued her surge of form with a defeat of Tunisian Ons Jabeur 7-5, 6-0.

The victory came a day after Bacsinszky earned one of her biggest career wins with a knockout of 2010 French Open finalist Samantha Stosur in the first round.