Valentino Rossi says the potential of Marc Marquez remains the “big question mark” for this weekend’s Czech Grand Prix following the first day of practice. Having been only sixth fastest in the morning at Brno, Marquez ended up topping the day's running right at the end of the second practice session, edging Andrea Iannone and Jorge Lorenzo by a tenth of a second. That demoted Rossi to fifth on the timesheets, and the Italian thinks that Marquez's late spurt – which followed a miraculous save earlier in the session – suggests the Spaniard could be a threat in the race. "Six or seven riders have a good pace," Rossi told media on Friday. "At this moment, I think...
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