Sian, 21, was a member of the Welsh sprint team who finished third in the final of the four by 100 metres relay. In the finishing third, the team recorded a time of 45.37 seconds to lower a Welsh record that had stood for 20 years. Sian produced a personal best time of 23.82 seconds in the 200 meters individual event semi-final two days earlier, coming 7th in the race overall.