In October 2007, Troop ran 2:10:31 at the Berlin Marathon – an Olympic A-grade qualifying time. In May 2008, Troop was the only nomination for the Australian Men's team in the marathon for the 2008 Beijing Olympics. Troop said he wanted to emulate the feats of Australian marathon legends Robert de Castella and his coach Steve Moneghetti in achieving a top 10 placing at the Olympic Games. In the 2008 Olympic marathon race he finished 60th in a time of 2:27:17.