DOHA, Qatar (AP) — Rafael Nadal and Roger Federer remain on course to meet in the Qatar Open final after both won their quarterfinals in straight sets on Thursday.

Federer, a two-time champion in Doha, routed sixth-seeded Viktor Troicki 6-2, 6-2 in just 65 minutes and will face third-seeded Jo-Wilfried Tsonga in the semifinals.

Top-ranked Nadal was given more of a test by Latvia’s Ernests Gulbis before he came through 7-6 (3), 6-3.

“It is always a difficult match against him,” Nadal said. “You have to play special against him. I did my best today and I am happy about it.

“I pushed him hard and broke him many times. I am playing well. My target here is to win (the title).”

Nadal plays defending champion Nikolay Davydenko of Russia or Ivo Karlovic of Croatia on Friday.

The Spaniard broke Gulbis in the fourth game of the first set and though Gulbis broke back, the 22-year-old Latvian could not maintain his form in the tiebreaker and Nadal won four points in a row to take it.

On Wednesday, Nadal dropped the second set 6-0 against Lukas Lacko after taking the first on a tiebreaker, but there was no repeat against Gulbis and he broke twice more to win inside two hours.

Federer, who won the title in 2005 and 2006, had little trouble improving his win-loss record at the tournament to 21-3.