ROTTERDAM, Netherlands (AP) -- Top-seeded Roger Federer easily beat Nicolas Mahut 6-4, 6-4 in the first round Wednesday to sail straight into the quarterfinals of the ABN Amro World Tennis Tournament.

Federer's second-round opponent Mikhail Youzhny withdrew with a foot injury, giving the Swiss star a place in the last eight.

The 16-time Grand Slam winner will face Jarkko Nieminen, who overcame Lukasz Kubot 6-3, 5-7, 7-6 (2).

Federer is making his first appearance in Rotterdam since 2005, and said "it's nice to be back.''

Second-seeded Tomas Berdych of the Czech Republic hit 10 aces to beat countryman Lukas Rosol 6-4 6-2 and earn a spot in the second round.

Third-seeded Juan Martin Del Potro, who is making his Rotterdam debut, beat 2008 champion Michael Llodra 6-4 6-7 (3) 6-4.

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