Lake Biwa Marathon
For the next two years, Troop was troubled by a series of injuries but bounced back in 2003, enjoying his best ever form. He ran a personal best of 2:09:49 at Lake Biwa Marathon, and finished 17th at the World Championships in Paris. He placed 27th at the 2004 Athens Olympic Games in the marathon with a time of 2:18.46. He broke down shortly after with a stress fracture of the pelvis.