Ernests Gulbis hails 'biggest win' of his career against Roger Federer

Ernests Gulbis has described his victory over Roger Federer in the fourth round of the French Open as the biggest of his career.

The Latvian world number 17 saw off the former champion on Sunday following a gruelling five-set encounter.

Gulbis will now take on Czech sixth seed Tomas Berdych for a place in the semi-finals at Roland Garros.

"It's the biggest win of my career," Gulbis is quoted as saying by the ATP's official website. "Sorry I had to win. I know how everyone likes Roger. It was a tough match but this is sport.

"I've been playing very well in France. I won tournaments in Marseille and Nice, hopefully Paris is the next one."

Gulbis's last appearance in a Grand Slam quarter-final was at the French Open six years ago.