Serena Williams' game has changed since her first US Open win in 1999 - USA TODAY

USA TODAY
Serena Williams' game has changed since her first US Open win in 1999
USA TODAY
NEW YORK — Seventeen years ago, at age 17, Serena Williams announced herself to the tennis world: She was the unexpected U.S. Open champion. She nearly stumbled backwards in disbelief as Martina Hingis' final backhand went long, with the ...
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