Norwegian nordic ski great Marit Bjoergen maintained her perfect start to the World Cup season here on Saturday as she won the 5 kilometres freestyle. The three-time Olympic champion, who won four world titles last season, posted a winning time of 11min 45.3sec beating Sweden's Charlotte Kalla by 11.6sec while another Norwegian Vibeke Kofsterud finished third 12.9sec adrift. Bjoergen won the opening two races of the season last weekend including anchoring the Norwegian 4x5km relay team at Susjon in Norway.