Wednesday's 17th stage: The 111-mile route took riders into Italy and was the first of three Alpine mountain stages that may well prove decisive.
Winner: Norway's Edvald Boasson Hagen finished 40 seconds ahead of Dutchman Bauke Mollema.
Yellow jersey: Thomas Voeckler of France remains in yellow, but he lost 27 seconds to all his main rivals.
Next stage: The 125-mile 18th stage (6 a.m., VS.) includes three climbs that are so steep they aren't even given a category. It ends with the 14.2-mile climb of the famed Col du Galibier -- 8,700 feet above sea level.
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