Germany completed the sweep of luge gold medals at the Beijing Olympics with a mixed relay victory on Thursday to win all four events. Germany clocked 3 minutes 03.406 seconds to set a new track record, but only in the last run with doubles pair Tobias Wendl and Tobias Arlt. Silver medallists Austria put down a phenomenal challenge and were ahead of the German team after Beijing champions Natalie Geisenberger and Johannes Ludwig had completed their runs. However, Wendl and Artl used their expertise to claim gold by only 0.08 second. Bronze went to Latvia, 0.948 second off the pace. Wendl and A…