OBERHOF, Germany — Olympic champion Natalie Geisenberger edged German compatriot Tatjana Huefner by one-thousandth of a second Sunday to win her fourth luge World Cup of the season on her birthday. The 29-year-old Geisenberger sped down the track in a combined time of 1 minute, 22.388 seconds over two runs, beating her teammate, the eight-time
