The Spaniard completed 17 laps of theJerezcircuit and ended the session fastest by over one tenth of a second from his compatriot Jorge Lorenzo. Casey Stoner was third fastest with Ducati once again impressing in the rain with Nicky Hayden and Valentino Rossi fourth and sixth fastest.
After struggling yesterday Cal Crutchlow was a fifth fastest with his Tech 3 teammate, Andrea Dovizioso, seventh.
The conditions were treacherous throughout the morning with all three classes seeing spectacular crashes. In the premier class Alvaro Bautista had a heavy fall at turn one but was unharmed. The former 125cc world champion ended the session 15th fastest behind the CRT bikes of Yonny Hernandez and Mattia Passini.
Andrea Iannone, the race winner at Jerez last year, was third fastest with Marc Marquez the only other rider within one second of Zarco.
The session saw numerous riders crash with Max Neukirchner, Yuki Takahashi and Mike di Meglio among them.
After taking a podium last time out Pol Espargaro has looked much more comfortable aboard a Moto2 bike this year compared to last and the Spaniard ended the session sixth fastest behind Randy Krummenacher.
In Moto3 Miguel Oliveria continued where he left off yesterday with the Portuguese rider once again topping the time aboard his Suter Honda. He ended the session over one second clear of the field with Arthur Sissis setting the next best time. The Australian rookie enjoyed a superb start to the year with a combative ride inQatarand he looks ready to challenge at the front of the field again this weekend. His Ajo KTM teammate, DaniKent, was third fastest.
Romano Fenati set the pace in the dry opening practice session yesterday but the Italian crashed during FP3. It will be interesting to see how he adjusts following the crash but having set the fifth fastest time in this session it is clear that riding in the wet does not faze him.
Maverick Vinales had a low key session with championship leader completing just a handful of laps en route to the 11th fastest time.
He was just ahead of Jack Miller but the Australian was unlucky to be caught out by Efren Vazquez’ accident. The Spaniard lost control as he accelerated onto the back straight leaving Miller with nowhere to go and an inevitable crash.