Marc Marquez provisionally continued his unbroken run of MotoGP pole positions at the Circuit of the Americas, but is under investigation for baulking closest rival Maverick Vinales. Marquez predictably led the opening runs at the Austin, Texas track with a best lap of 2m04.134s, giving himself a 0.394s buffer over nearest challenger Valentino Rossi. But the reigning champion lost the front end of his works Honda at Turn 13 mere moments later, forcing him to get a ride back to the pits to change to his second bike for the final part of the session. On his out lap for his second run, Marquez blocked Vinales while the Yamaha rider was on a hot lap, touring on the racing line at Turn 15....
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