Zulle won last year's title in Lausanne 10 days after winning the Tour of Spain and he goes into today's 11 days after victory in the same event.
The 29-year-old Swiss rider was forced to retire from the Tour of France in the summer when he fell on his broken collar-bone. But the lay-off has helped him finish the season fitter than most riders, and he said: "I've come here to win. I don't want another season like that but the rest did help."
Russia's Viacheslav Ekimov, another major contender, may not be fit after a training crash which left him needing six stitches in his scalp.