Marquez eventually finished fourth, one spot ahead of Quartararo.
Zarco finishes fastest from Bagnaia. Miller looked set to go quickest before making a mistake at the final corner.
Wow, Zarco goes top!
Bagnaia goes fastest by nearly two tenths.
Bagnaia is on a very fast lap...
Bastianini has been pushed out of the top ten as Zarco moves up to seventh.
Jorge Martin goes quickest on combined times. Impressive stuff from the Spaniard on his first flying lap.
It's time for the end-of-session time attacks.
Fabio Di Giannantonio has also suffered a front-end crash at turn three.
Cal Curtchlow has gone down at turn three, the same corner as Bezzecchi.
Johann Zarco has now gone quickest by nearly two tenths.
Only two riders have found time compared to FP1- Darryn Binder and Tetsuta Nagashima - who have both moved ahead of Danilo Petrucci.
Aprilia's difficult start to the weekend is conitnuing as Aleix Espargaro is 15th and Maverick Vinales 19th.
Most of the big hitters have now returned to pit lane, including Quartararo and Marini who were on-track together for the first 15 minutes.
Bagnaia goes top from Marquez by just 0.025s.
Bezzecchi has had a crash at turn three.
Marc Marquez currently leads the way in FP2 from Marco Bezzecchi.
Quartararo was seen waving Marini past (or attempting to) but the Ducati rider remains behind the Frenchman.
Quartararo is very angry with Luca Marini who has decided to follow him at the start of FP2.
And we're underway with MotoGP FP2 at Buriram.