Having started playing darts in 1991, Losper's first major tournament appearance was in the 2003 WDF World Cup with the South African team.
Having stayed with them for 3 years, he joined the Professional Darts Corporation in 2006 and made his first PDC tournament appearance in the South African Open.
Losper was drawn against then-World Champion Raymond van Barneveld and despite losing 4-1 was the only South African player to win a leg against the professionals.
He lost all three group games however, losing to Andy Hamilton, Terry Jenkins and Vincent van der Voort.
The next month Losper successfully defended his South African Open title with a 4–1 victory over Mark Jackson, which earned him a place in the 2009 PDC World Championship.