Austin - Spain's Marc Marquez dominated both of Friday's free practice sessions for Sunday's Grand Prix of Americas race which marks the second event of the 2013 MotoGP season.
The 20-year-old Marquez, who rides for Repsol Honda, had the fastest time in both sessions on the brand new Texas track, finishing more than half a second ahead of fellow Spaniard Dani Pedrosa.
Germany's Stefan Bradl, Spaniard Jorge Lorenzo, who is the reigning world champion and winner of the first Qatar Grand Prix of the season, and Italy's Valentino Rossi rounded out the top five.
Marquez posted the best lap time in his second practice run.
In early April, he took third place in the Qatar race, finishing behind Lorenzo and Rossi.
Yamaha teammates Lorenzo and Rossi practised one day after receiving a scare when a fire broke out early Thursday in a building next to their main garage.
The fire resulted in the MotoGP machines and the team's equipment being heavily doused in water and fire retardant materials from the sprinkler system. The bikes had to be taken apart, cleaned and dried out, and then re-assembled.
Circuit of the Americas now becomes the third US venue on the MotoGP calendar, along with Laguna Seca and Indianapolis. Laguna Seca is scheduled for July while Indianapolis takes place in August.