Movistar Yamaha's Jorge Lorenzo is confident he can close the gap at the top after finishing second quickest during the first free practice sessions for the Jerez MotoGP.

Lorenzo, who tested a new chassis on the YZR-M1 in Spain along with team-mate Valentino Rossi, which is aimed at improving stability under braking, recorded his best lap in 1m 39.714s in FP1.

Yamaha's official press statement said 'positive results were obtained' with the new chassis, giving engineers a 'clear direction' for further development.

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Lorenzo, who finished 0.357s behind 'Open' class rider Aleix Espargaro (NGM Forward Yamaha) said: "The track changed so much from the morning to the afternoon, it was much more slippery and we had to try the different rear tyre.

"Like in Qatar it gave us the same problems with less grip and the bike then feels nervous. We are much closer than before though and I think we can close the gap."

Lorenzo and Rossi both struggled with a lack of rear grip in the intense heat at the Spanish venue and will focus on finding set-ups that work best in the contrasting morning and afternoon tracks temperatures on Saturday.