He won many amateur titles before turning professional in 2002 at the age of 19.
He won the English Amateur twice before turning professional in 1995.
He won a grade 1 junior event in Venezuela, before turning professional at the age of 18.
He turned professional in 1968, spent many years working as a club professional, and won only minor tournaments before turning fifty.
He made his name in academia by writing about a great range of subjects and won tenure at Harvard before turning 30.
They won a number of amateur competitions before turning professional.
He won the British Boys' Championship before turning professional in 1973.
He won several amateur events in Australia before turning professional in 2010.
He had a successful college golf career, winning four tournaments before turning professional in 2007.
Hansen won his national open in 1999 as an amateur, before turning professional in 2003 at the age of 25.