Ken Duke was born on January 29th, 1969 in Arizona, USA. He turned pro in 1994 and joined the Nationwide Tour the following season. After little success he moved onto the Canadian Tour. He has also played on the South American Tour and Asian Tours.

In 2004 he played on the PGA Tour for the first time but ended the year 166th on the money list. This meant he had to return to the Nationwide Tour. After a steady first season he won an event early in 2006, the BMW Charity Pro Am. This helped Duke top the money list and win a place on the PGA Tour.