Worsley's first shooting competition was at the 1994 National Disabled Championships in Melbourne, where he broke 3 Australian records. That same year he competed at the FESPIC Games in Beijing. He won a gold medal in the Men's Air Rifle prone 60 shots event and a silver medal in the Men's Air Rifle 3×40 shots events. At the 1995 European Championships in Finland, he finished in 4th position in the Men's Air Rifle prone event, breaking his own Australian record with a 598/600. At the 1996 Atlanta Paralympics, he came in 22nd and 23rd in the Mixed Air Rifle SH2 events in standing and prone events respectively, and 17th in the Mixed Air Rifle 3×40 shots SH2 events. At the 1998 World Shooting Championships for the Disabled in Spain, he finished in 20th and 23rd position in the standing and prone events, respectively. At the 1999 Oceania Championships, Cecil Park Sydney, Worsley finished in 7th and 4th position in Mixed standing and prone events. With final scores of 596 and 585 in prone and standing, respectively, Worsley qualified for selection at the 2000 Summer Paralympics in Sydney. At the Korean World Championships in 2002, Worsley finished in 15th position in Air Rifle prone SH2 event. At the 2003 Swiss Open Championships, Worsley broke his prone Australian record, shot a Personal Best of 600/600 and finished in 2nd position in the final. He was one of the top 80 athletes who received an invitation to compete at the Fiocchi Final in Italy that year. At the time of these championships, he held three Australian records in standing, prone, and 3×40 shots events, was ranked fourth in the world in his classification, and broke a new Australian record for standing over 10 metres. At the 2000 Sydney Paralympics, he finished in 6th position in the standing and prone events, while he finished in 21st position in standing and 23rd in prone at the 2004 Athens Paralympics.