Austin:  A supremely-confident Sebastian Vettel topped the times with ease ahead of his Red Bull team-mate Mark Webber in Friday's second free practice session for this weekend's United States Grand Prix.After a frustrating morning session curtailed by fog, during which he was only 18th fastest, the newly-crowned four-time world champion blasted back to lead the way.He clocked a best lap in one minute and 37.305 seconds to finish one-tenth of a second ahead of his retirement-bound team-mate who later suggested that the champion may have been toying with his rivals."The circuit was quite slippery today," Vettel explained."I was happy with the car, but you always know you...
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