By Martyn Herman LONDON (Reuters) - Mark Cavendish will get the chance to claim a long-awaited Olympic medal in Rio de Janeiro this year after being named in Britain's track cycling team on Friday. The 30-year-old, the most prolific road sprinter of his generation with 26 Tour de France stage wins, will take part in the multi-discipline omnium event in the Rio velodrome. Cavendish, who will ride he Tour de France for Team Dimension Data, missed out on a road race medal at the London 2012 Olympics and in the Madison in Beijing eight years ago when partnering Bradley Wiggins. More...