In 2009, along with his powerlifting, Duke began entering para sport athletic events. He competed in both the F40 shot put and javelin at the CP Sport Grand Prix in Nottingham and the Czech Open. In 2010 as well as the Nottingham Grand Prix, Duke also entered the Berlin Open. In Berlin he finished fourth in the discus and shot put and first in the javelin, equalling his personal best of 29.53m. In 2011 Duke took gold medal in the javelin at the IWAS World Junior Championships held in Dubai, and recorded a personal best in the javelin of 33.38m at the Czech Open. 2011 also saw Duke qualified for the IPC Athletics World Championships at the men's F40 – javelin. His throw of 32.64 earned him the bronze medal.