Marc Marquez forged to the top of the times in FP2 on a drying track at the Circuit of the Americas in Austin, Texas with a flying final lap.

The MotoGP world champion made the most of the improved conditions towards the end of the session to grab the top spot on the RC213V, lapping in 2m 04.835s to bump Andrea Iannone into second place on the Ducati, before Britain's Cal Crutchlow bettered his time on the CWM LCR Honda to slot in behind Marquez on his last lap with a time of 2m 05.162s.

Crutchlow's time was 0.327s behind Marquez, who is bidding for a third straight at the Austin MotoGP this weekend.

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Iannone held onto third as the lap times tumbled in the final minutes after the session had began with most riders venturing out on used wets, the Italian setting his quickest time in 2m 05.190s as he finished ahead of Suzuki's Aleix Espargaro, who was fourth overall on the GSX-RR with a lap in 2m 05.564s.

Andrea Dovizioso was another improver on the factory Ducati GP15 as he ended FP2 in fifth, lapping in 2m 05.646s and edging out championship leader Valentino Rossi, who completed the afternoon as the top Yamaha rider (2m 05.691s) - finishing 0.856s down on Marquez's benchmark.

Rossi's team-mate Jorge Lorenzo was back in 11th place with a time of 2m 06.174s and could find himself having to qualify for Q2 on Saturday via Q1 should FP2 prove to be the final dry free practice session of the weekend, with forecasters predicting more rain on Saturday.

Pol Espargaro on the satellite Monster Yamaha Tech 3 machine rounded out the top six in 2m 05.840s behind Rossi, followed by Stefan Bradl on the Forward Yamaha - the top Open class rider - and Pramac Ducati's Yonny Hernandez.

Bradley Smith went down at turn 1 moments after posting the fourth fastest time on the Monster Yamaha Tech 3 M1, eventually slipping down the time sheets to 10th place but still finishing ahead of factory rider Lorenzo.

Scott Redding clocked the 12th fastest time on the EG 0,0 Marc VDS Honda ahead of Danilo Petrucci (Pramac Ducati), with class rookie Maverick Vinales 15th on the second of the Suzuki machines and Hiroshi Aoyama, who is standing in for Dani Pedrosa, 16th on the Repsol Honda.

American rider Nicky Hayden was a disappointing 22nd on the Aspar Honda, finishing behind team-mate and MotoGP rookie Eugene Laverty, who was 20th on the RC213V-RS as he competes at the Circuit of the Americas for the very first time.

Aussie Jack Miller (CWM LCR Honda) was 19th fastest while Alvaro Bautista was 17th quickest on the Aprilia.