RIO DE JANEIRO, Aug 16 (Reuters) - Germany's Kristina Voegel won the women's sprint in the Olympic velodrome on Tuesday, out-pacing Britain's Rebecca James in the final to take the gold medal. James's team mate Katy Marchant took the bronze after edging out keirin champion Elis Ligtlee of the Netherlands. Voegel, a former world champion, won the team sprint in London four years ago but had never claimed the individual title. (Reporting by Martyn Herman, editing by Ed Osmond) More...