Valentino Rossi insists he won't be trying to play mind games with reigning MotoGP champion Marc Marquez, saying all that matters mentally is speed on the track.

Rossi, who has been chasing a tenth world title since 2010, leads the standings by six points from Ducati's Andrea Dovizioso.

But most expect undefeated double champion Marquez to soon emerge as Rossi's biggest threat. The Repsol Honda star trails the Italian by 30-points after their collision in Argentina, but there are still 15 rounds to go.

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"I think that the psychological side is not important. It's just important to have speed on the track," said Rossi, widely regarded as a master of mind games during his previous championship battles.

"The rest, we spoke a lot also in the past about my rivals, but for me psychologically you cannot do anything. You have to work and try to be competitive on Sundays. This is the key for the psychological effect!"

The Italian added: "Marc is very strong in the battles and he beat me in the past. So we just have to be more competitive in braking and entering the corner, where usually he is stronger than us. We have to demonstrate we have improved the bike and can brake deeper."

Rossi's second win in three starts - Marquez won at Austin - came after he used the hardest rear tyre to reel-in his young rival, bridging a four-second gap to reach the Spaniard with three laps to go.

It was an unusual style of victory, but one that Rossi believes could happen again this season due to the different characteristics of the Yamaha and Honda. However he doubts such a race will occur at Jerez on Sunday.

"I think it can happen in another weekend because the Honda and Yamaha are very different, also for the tyres. So sometimes it can happen, but I don't think here," he declared.

"At the same time I'm not sure about the hard tyre here. Everybody expected better from the hard, because it was the best tyre here last year, but for some reason - maybe less grip on the asphalt or something - the soft is now also an option for everybody."

Rossi was speaking after Friday practice for the Spanish round, where he was ninth fastest while using the hardest rear tyre. Marquez, riding with a finger injury from a training accident, was third quickest.