Doha: Top-ranked Rafael Nadal and No. 2 Roger Federer advanced to the quarter finals of the Qatar Open on Wednesday, each winning in straight sets.

Nadal beat Karol Beck of Slovakia 6-1, 6-2, and Federer defeated Andreas Seppi of Italy 6-3, 6-3.

“I am happy because it was an important win,” said Nadal, who was broken once but took advantage of 27 unforced errors from Beck.

The top-ranked Spaniard will next play fifth-seeded Gael Monfils of France in the quarterfinals on Thursday.

Andy Murray, who lost to Federer in last year’s US Open final, also advanced. The fourth-ranked Briton defeated Philipp Petzschner of Germany 6-2, 6-4.