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.
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.