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Two days after the bidding opened, Federer's racket was easily the most sought after, with the latest of 87 bids offering $13,300. The next most-wanted racket is Rafael Nadal's, with a current bid of $4,150.
Novak Djokovic, Kim Clijsters and Jelena Dokic have also donated their rackets.
The eBay auction, which opened Tuesday and closes after the men's final on Sunday, follows "Hit for Haiti" -- a charity match initiated by Federer on the eve of the tournament.
That mixed doubles match -- where the public paid discounted prices and the players wore microphones -- raised more than $185,000.
The Jan. 12 earthquake in Haiti killed an estimated 200,000 people.