Wiggins, who took nearly two minutes from defending champion Cadel Evans when he won the stage nine time-trial over 41.5km, went into the 53.5km race against the clock with a 2min 05sec lead over Sky team-mate Chris Froome.
And after a smooth, controlled ride over a course that suited him to perfection, the 32-year-old Englishman increased his advantage on the Kenyan-born Briton, who finished second on the stage at 1min 16sec.
It means Wiggins will go into today’s final stage to Paris — which usually does not host a battle for the yellow jersey — with an overall lead of 3:21 on Froome.
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