By Julien Pretot TOURS, France (Reuters) - German Marcel Kittel claimed his third victory on this year's Tour de France when he pipped Mark Cavendish on the line to take the 12th stage on Thursday. Kittel, who won the first and 10th stages, stayed behind the Briton's wheel in the final straight and went past Cavendish at the very last moment. Britain's Chris Froome avoided a late pile-up in the bunch and retained the overall leader's yellow jersey. Kittel became the first German rider to win three stages in the same Tour since fellow sprinter Erik Zabel in 2001. ... More...