Mawson's parents were born in Britain, and he also lived in Bolton, England for four years between the ages of 3–7 before moving back to Canada.
As a result of his performances on the North American circuit including his Vegas quarter-final, he qualified for the inaugural Grand Slam of Darts in 2007 and was back at the World Championships in 2008 for the first time since 2000.
It was a tournament that Mawson very nearly didn't play in, as he had accidentally left his Canadian passport at JFK airport in New York City.
During the 2008 UK Open, Mawson became popular with British fans due to his resemblance to then Liverpool manager Rafael Benítez.
Mawson played in the 2008 Grand Slam of Darts, which he earned a place in by reaching the final of the 2008 UK Open but lost out in the group stages.
He represented the United States with Darin Young in the 2012 PDC World Cup of Darts and reached the quarter-finals, where they were defeated by England 1–3, having beaten Germany in the second round.
Mawson was responsible for the point picked up against England as he defeated 15-time World Champion Phil Taylor in his singles match.