Debut

Just after his 14th birthday Casey and his parents decided to make the move overseas and packed up and headed to England to start his road racing career. Casey could not legally road race in Australia until he was 16, but had decided he was ready for the challenge. So the decision was made to move to England where Casey was already of legal age to race. A big risk to take, but it paid off. Casey was lucky enough and talented enough to attract immediate sponsorship after just one race in England. He went on to take out the English 125cc Aprilia Championship in 2000, in his first year of road racing. In that year he also raced two rounds of the Spanish 125cc Championship. It was there he was noticed by GP great Alberto Puig. Alberto was impressed by Casey's determination and skill and invited him to race for the Telefonica Movistar Team in the 125cc Spanish Championships the next year.

In 2001 Casey raced in both the English and Spanish championships in the same year. Despite missing some English races due to clashes with Spanish rounds, he still managed to come second in both championships. In that same year he was also granted wildcard entries into the MotoGP 125cc world series, in both England and Australia. He placed 18th and 12th respectively and as a result was offered a ride in the Grand Prix world series the next year for the Safilo Oxydo LCR team. Straight onto a 250cc machine in his rookie year, and at only 16 years of age, Casey demonstrated his ability and speed with results. His best result for the year was a 5th at Brno as well as several 6th place finishes.