Marc Marquez has pinpointed Maverick Vinales as his biggest challenger for victory in this weekend's MotoGP race at the Circuit of the Americas. Honda rider Marquez has never lost at Austin since the track was added to the calendar in 2013, but ended up second-fastest on the opening day of action of COTA behind Suzuki's Andrea Iannone. Vinales - who is in the midst of an 11-month win drought - was third, just two tenths slower than Marquez, and the reigning champion said the difference in race pace between himself and his Yamaha rival is small. “I have a good pace, but Vinales is close,” said Marquez. “It’s true that I’m a step ahead, but there’s not much difference either....
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