Stone Tsang Siu-keung reinforced his growing reputation as Hong Kong's leading trail runner by winning the final race of the North Face King of the Hills mountain marathon series at Sai Kung yesterday. The Champion System Adventure Team star (pictured) beat teammate Darren Benson by almost seven minutes over the 37.5-kilometre course. Tsang clocked three hours, 34 minutes and 59 seconds. William Davies won the overall series despite finishing 15th yesterday.