Lexi Thompson fired a two-under 70 to get to 17 under and win the Navistar LPGA Classic. She is the youngest winner in the history of the LPGA.
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Thompson turned pro on June 16, 2010 as a 15-year-old. She made her first paycheck that year after finishing T10 at the U.S. Women's Open, her fourth appearance in the event.
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Her best finish on the LPGA Tour before the Navistar was a T2 at the 2010 Evian Masters.
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Thompson is still not a member of the LPGA Tour which restricts membership to players who are 18 and older. Commissioner Mike Whan agreed to allow her to play in 2011 Q-school, meaning that if she is successful she could be a full member in 2012 as a 17-year-old.
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Thompson began the final round at the Navistar with a five-shot lead. By the 10th hole, she had extended her lead to seven.
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Bogeys at the 11th and 12th holes cut Thompson's lead to four, but she rallied with birdies on 16 and 17 to grow her lead.
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Tiffany Joh finished a distant second at 12 under.