Three former champions take centre stage

Agassi, champion in 1994 and 1999 and seeded seventh, faces Croatian Ivo Karlovic [ Images ], the world number 94.

Karlovic upset Lleyton Hewitt [ Images ], the then defending champion, in the first round at Wimbledon [ Images ] in 2003 and recently reached the quarter-finals in Washington.

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Gilles Muller, of Luxembourg, follows up his victory over fourth seed Andy Roddick [ Images ] with a clash against Robby Ginepri, while Guillermo Coria of Argentina, the eighth seed, faces another American, Vince Spadea.

Women's second seed Davenport, runner-up at the Australian Open [ Images ] and Wimbledon this year and winner at Flushing Meadows in 1998, continues her title bid against Pauline Parmentier of France [ Images ].

Belgian seventh seed Justine Henin-Hardenne, the 2003 champion, plays Spaniard Maria Sanchez Lorenzo, while third seed Amelie Mauresmo [ Images ] of France takes on 16-year-old Sesil Karatantcheva of Bulgaria.

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