Ahn turned professional in 2002 and that year she topped the order of merit on the Apache Dream Tour (the KLPGA's developmental tour) after winning three times. In 2003, she won the CJ Nine Bridges Classic, an LPGA Tour sanctioned event in her home country. At 19 years, 1 month and 18 days she was the youngest non-American winner in the tour's history. She also finished fourth on the LPGA of Korea Tour money list. In 2004, she was the Rookie of the Year on the U.S. based LPGA Tour, after finishing in sole second place in the LPGA Championship, which is one of the four LPGA majors and finishing sixteenth on the money list. She also won the MBC-Xcanvas Open on the LPGA of Korea Tour that year. In 2005, she finished 36th on the LPGA Tour money list.
During her second round of play at the 2009 LPGA Championship, Ahn struck and killed a robin with her tee shot on the 9th hole.
While playing in the 2010 CN Canadian Women's Open, Ahn and fellow South Korean golfer Il Mi Chung were accused of taking part in a rules violation cover-up after they each accidentally hit the other's golf ball on the 18th hole during the first round of play. Chung and Ahn were disqualified after the round. The LPGA launched an investigation into what took place. A tour official said "One thing that is clear is that both players called the penalty on themselves and as a result, both players were disqualified. They admitted their mistake and accepted the penalty, so the Rules of Golf were adhered to."

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