Grand Slam Grow Up: See Serena Williams' Iconic Moments

Image: Serena Williams, 17, celebrates her win at the 1999 U.S. Open
1999: Serena Williams, 17, celebrates her win over Martina Hingis of Switzerland in the women's final of the U.S. Open at the USTA National Tennis Center in Flushing Meadows, New York on Sept. 11. Williams defeated Hingis to win her first U.S. Open title. Jamie Squire / Getty Images

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