She turned pro in 1996, and slowly worked her way up in the standings. She cracked the Top 50 in 1999, but it took her another three years before she actually won an LPGA tournament. Since then, she has played well consistently, and has racked up 22 professionals wins, 16 of them on the LPGA Tour. She has tied for second at both the Kraft Nabisco Championship and the Women’s British Open, and she won the U.S. Women’s Open in 2007, and the LPGA Championship in 2010. She has been ranked first in the world three times.