Mark Webber concedes he will have a tough time taking on team-mate Sebastian Vettel at this weekend's United States GP. Vettel was quickest in Friday's second practice at the Circuit of the Americas were last year's pole sitter set the pace on a short run on the medium tyres. The German, though, needed a few attempts at it as traffic cost him not once but twice resulting in his P1 time being set on his fourth lap. "Seb did a pretty good lap - on his fourth attempt," Webber told Autosport. "So I don't think he got the best out of his tyre unfortunately. Fortunately for him but unfortunately for us." The Aussie, who is set to retire from F1 at the end of this seaosn,...
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