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Top two through in Rotterdam

Roger Federer remains on course to defend his title at the ABN AMRO World Tennis Tournament after a 6-3 6-4 win over Thiemo De Bakker.

The world number two - who also lifted the trophy at the event back in 2005 - needed just over an hour to see off the Dutchman, early breaks of serve in both sets putting him on course for a routine victory.

"He had a clear game plan with a lot of variation so I never really got into a rally," the Swiss said afterwards. "He was also unpredictable for me."

Federer will now face Frenchman Julien Benneteau, a player he defeated twice on grass at Wimbledon last season, for a place in the semi-finals in Rotterdam.

Juan Martin del Potro - the man Federer defeated in last year's final - also made it through to the last eight with a 7-6 (7/5) 6-3 victory over Ernests Gulbis.

The second seed prevailed against the Latvian, who was once ranked inside the top 30 in the world but now languishes down at No.132. The Argentine will face Jarkko Nieminen after the Finn dispatched German qualifier Matthias Bachinger 6-3 5-7 6-3.

"It was a really tough match, he's a strong player," said Del Potro. "I was a bit lucky in the (first-set tiebreaker). Then in the second set I improved my game and closed it out."

Meanwhile, Marcos Baghdatis handed Richard Gasquet only his second loss of the season as the Cypriot reached the quarter-finals thanks to a 6-4 6-4 result against the Frenchman.

The only previous defeat for Gasquet - who has won two titles on the ATP Tour this year - came at the hands of compatriot Jo-Wilfried Tsonga at the Australian Open.

Baghdatis triumphed in 76 minutes, with nine aces and two breaks of serve, and will now face Bulgarian Grigor Dimitrov.

The final match of the day saw Martin Klizan knock out Dutchman Igor Sijsling 6-2 6-4.