Agassi plays his first match Saturday, as does Federer, who also could meet Roddick in the final. Roddick, No. 3 seed Marat Safin, No. 5 Carlos Moya and No. 21 Vince Spadea of Boca Raton open on Friday.
Also opposite Sharapova and Williams: No. 1 seed Amelie Mauresmo of France, who begins play Saturday.
Sharapova, Serena Williams and Venus Williams all play Friday.