Katherine Grainger wins first gold after claiming silver in previous three Olympics . The 23-year-old from England won `` Just before halfway I knew we had won it , '' said 29-year-old Watkins . Fellow Kiwi Mahe Drysdale clinches gold in men 's single sculls . Germany ease to victory in men 's quadruple sculls from Croatia and Australia .
Katherine Grainger wins first gold after claiming silver in previous three Olympics . The 23-year-old from England won Fellow Kiwi Mahe Drysdale clinches gold in men 's single sculls . Germany ease to victory in men 's quadruple sculls from Croatia and Australia .