2001 to 2004
After turning professional in 2001, Dixon spent several years going between the Challenge Tour and the European Tour. He first earned his playing card at the 2002 year-end qualifying school. In 2003, Dixon played 27 European Tour events, making the cut in only nine tournaments. As a result, he finished 158th on the Order of Merit and could not keep his playing card. He regained a spot on the tour for 2004 in qualifying school, but again was unable to keep it at the end of the year.
Dixon only played three European Tour events in 2005, making the cut in all three. His best finish was 11th place in the Saint Omer Open. He played in 27 Challenge Tour events, only missing nine cuts. At the end of the season, Dixon was ranked 27th on the tour's money list. He played well enough in the 2005 qualifying school to earn full-time status on the European Tour for 2006.
2006 to 2007
In 2006, Dixon played in 26 events on the European Tour and made the cut in 12 of them. His highest finish was a tie for sixth in the Saint Omer Open. He finished 151th on the Order of Merit and was dropped to part-time status again for 2007. He made the cut in only one of the five 2007 European Tour events he entered. His Challenge Tour results were not much better. His highest finish of the year was 13th in the Oceanico Developments Pro-Am Challenge.
In 2008, Dixon won his first event as a professional, the European Tour's Saint Omer Open. This gave him full-time status on the tour for the remainder of the 2008 season. His only other top-10 finish of the year was a tie for sixth in the Alfred Dunhill Championship.
Through the first week of August, Dixon had played in 21 events on the European Tour in 2009. He made the cut in seven of those starts and was ranked 128th on the Order of Merit. He had posted two top-10 finishes, taking sixth in the Volvo China Open and seventh in the Joburg Open.