Svartedal completed the course in 37 minutes, 54.9 seconds, beating Austria's Martin Tauber by 20.9 seconds. Vincent Vittoz of France was 23.6 seconds back in third.
Tauber looked poised to win after favorites overall leader Tobias Angerer and Pietro Piller Cottrer peeled off the front, but Svartedal surged forward just after 11km and was soon out of reach.
Angerer finished sixth, but retained the overall lead with 725 points. Norway's Tor Arne Hetland is second on 499, while Sweden's Bjoern Lind is third on 463.
Finland's Virpi Kuitunen easily won the women's 10km classic in 27 minutes, 58.8 seconds, 31.8 ahead of Canada's Sara Renner, the surprise runner-up. Slovenia's Petra Majdic was third, 36.1 back, while another Canadian, Beckie Scott, was 43.1 behind in fourth place.
After 17 of 24 races, Norway's Marit Bjoergen still leads the overall standings with 645 points.
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