Jorge Lorenzo feels his final corner clash with Marc Marquez at Jerez in Spain was one of the decisive factors in his failed bid to retain the MotoGP World Championship.

There was contact between the pair at the third round of the season as Marquez barged past on the final lap, running Lorenzo wide in their battle for second place after Dani Pedrosa had pulled clear to win.

Injury also had a detrimental impact on Yamaha star Lorenzo's title hopes when he suffered a broken collarbone following a spill at Assen and re-damaged it next time in Germany.

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Lorenzo, who lost his crown in Valencia by four points to Marquez after he secured his eighth victory of the season on the YZR-M1, said: "The mistake not to close the door [on Marquez in the last corner] at Jerez could have been enough to win the title, but also we made a bigger mistake in Holland [breaking the collarbone] and then again two weeks later in Germany.

"In this period and the races after we lost too many points to Marc. But anyway Marc made mistakes at Mugello and Phillip Island. So all in all I think Marc deserved the championship."

Significant gains with the Yamaha in the final part of the season also gave Lorenzo a boost and the deposed former champion believes he could have challenged for more wins had progress been made sooner.

"We improved the bike a lot during the last part of the season. Maybe with this bike from the beginning we could make more victories," he said.

"At the moment the three of us [Lorenzo, Marquez, Pedrosa] are at a very high level and the others cannot stay with us in the race.

"Things can change in the future, but now our level is very high and it will be difficult to improve further.

"But I will try as always to make some steps forward for next year and Yamaha are also trying to improve the bike so I'm very positive for next year."