Marc Marquez laughed off a nudge from MotoGP title rival Jorge Lorenzo as the pair lined-up for a practice start at the end of morning practice for the Valencia championship showdown.

Reigning champion Lorenzo, 13 points behind rookie Marquez, pulled up behind the stationary Repsol Honda rider and gently nudged his back wheel, prompting a backward glance and slight shake of the head from Marquez.

After finishing the day fastest in both sessions, Marquez said: "He tried to use his experience but it's normal to try and put some pressure on me, but for me it was a funny situation and another motivation."

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Lorenzo insisted he was not trying to unsettle Marquez.

"It was a simple joke and I made it to other riders in the past, Colin Edwards at Mugello two years ago, so it's just a joke and not important. There are different interpretations of a joke so it's not important."

Marquez is bidding to become the first rookie title winner since 1978. The 20-year-old will be champion with a top four finish, even if Lorenzo wins the race.

Lorenzo was third fastest on Friday, 0.158s from Marquez and 0.092s from the other factory Honda of Dani Pedrosa.