eigning World Champion Marc Márquez vaulted to the top of the timesheets during the second practice session at the Circuit of the Americas.Márquez traded quick times with Yamaha rival Maverick Viñales during the course of the 45-minute session, with Viñales moving two-tenths clear up front midway through proceedings.Their hegemony was broken during the closing stages when Tech 3's Johann Zarco surprisingly went quickest, before Márquez returned to the front on his last lap.Márquez, who remains unbeaten in MotoGP on American soil, finished with a 2:04.061, 0.286s in front of Zarco, with FP1 pacesetter Viñales a tenth further back in third.Valentino Rossi and Dani Pedrosa placed fourth...
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