No. 1 Roger Federer outclassed fellow Swiss Stanislas Wawrinka 6-1, 6-4 at the ABN Amro on Thursday, advancing to the quarterfinals with a second consecutive straight-set victory.
Also, third-seeded Tim Henman beat Michael Llodra of France 6-4, 6-1.
In other action, Thomas Johansson served 15 aces to upset fellow Swede and fifth-seeded Joachim Johansson 6-4, 6-4.
The two are not related.
Ivan Ljubicic edged Sjeng Schalken again after beating him in last week's Marseille quarterfinal, 6-4, 5-7, 6-3.
In another match, Mario Ancic of Croatia defeated Olivier Rochus of Belgium 6-4, 6-3.
Top seed Amelie Mauresmo swept past Mary Pierce 6-4, 6-1 in an all-French battle to reach the quarterfinals of the Diamond Games.
Second seed Anastasia Myskina of Russia had a much tougher time against another Frenchwoman, Tatiana Golovin, before prevailing 6-3, 6-7 (6), 6-4.
In Friday's quarterfinal, Myskina will play Katarina Srebotnik of Slovenia, who beat Anna Chakvetadze of Russia 4-6, 6-1, 7-6 (12).
In other second-round action, No. 4 Alicia Molik of Australia had to rely on her service game to rally against Bulgaria's Magdalena Maleeva, 4-6, 6-2, 7-6 (7).
Second-seeded Tommy Haas of Germany beat Kevin Kim 7-6 (4), 6-3 to advance to the quarterfinals of the Regions Morgan Keegan Championships.
Haas will face fifth-seeded Xavier Malisse of Belgium, a 6-2, 6-2 winner over Canada's Frank Dancevic.
In the WTA Cellular South Cup, top-seeded Russian Vera Zvonareva beat Katerina Bondarenko of Ukraine 7-5, 6-0 to advance to the semifinals. The defending champion will face eighth-seeded Evgenia Linetskaya of Russia, a 6-2, 6-2 winner over Japan's Akiko Morigami.
Unseeded Alberto Martin of Spain upset seventh-seeded Mariano Zabaleta of Argentina 7-6 (6), 6-4 and advanced to the semifinals of the US$380,000 (297,760 euro) ATP Brazil Open.
In the other semifinal, local favorite Ricardo Mello will face sixth-seeded Rafael Nadal of Spain. Mello defeated Spain's Santiago Ventura 7-5, 6-1, while Nadal beat Agustin Calleri of Argentina 6-2, 6-7 (5), 6-4.
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