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No wonder Lindsay Davenport is one of the most popular players in women's tennis: She has a big serve, a big return, a big heart ... and, apparently, a very big autograph. Davenport signed oversized souvenir balls after her fourth-round win over Patty Schnyder at the U.S. Open, two days before she was eliminated by Justine Henin-Hardenne in the quarterfinals. Davenport, 30, fell short of winning her fourth major, then downplayed speculation that this will be her last Open, saying she wasn't sure if she'd retire.