Movistar Yamaha's Jorge Lorenzo says victory at Aragon was essential to keep alive his chances of becoming MotoGP World Champion for a third time.

Lorenzo dominated the race, leading from start to finish to claim all 25 points and reduce team-mate Valentino Rossi's title lead by nine points to 14 with four races remaining.

The Majorcan had Repsol Honda's Dani Pedrosa to thank after the Spaniard managed to come out on top of a frantic scrap with Rossi for the runner-up spot, denying the championship leader four extra points and keeping the flag flying for Honda after Marc Marquez had crashed out of second place on lap two.

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It was a pivotal victory for Lorenzo, who had been tied on points with Rossi entering the British MotoGP at Silverstone before slipping 23 points behind the nine-time world champion heading to Aragon after two weather affected races at the British track and Misano last time out, where Lorenzo was caught out by the conditions.

The 28-year-old is now firmly back in the title race and the importance of his victory on Sunday was not lost on the two-time premier class champion, who was celebrating his sixth win of 2015.

"It was a really important race and I thought this on Thursday because if I had lost even more points in this race it would be almost impossible to win the world title," said Lorenzo.

"It has been the key today to be so fast in the race and especially quite a bit lucky with how Marc [Marquez] had crashed. I didn't expect [the crash] and I knew Marc is very strong here, especially after one lap and also in the second part of the race, so it would be very complicated to beat him today and I've been lucky for his crash.

"I push so much, not because I wanted to escape from Marc, but also to put some gap into Dani [Pedrosa] and Valentino [Rossi]," Lorenzo added.

"When I waited one more lap to see the board and I saw 'Dani +2.3', I felt I could breathe, but then suddenly I said to myself I have to keep focused because Dani is going to try his best and always in this track he has good pace and especially having Valentino on his back, he would push at the maximum all the race.

"I couldn't relax any time and I had to keep focused and ride very precise to keep the rhythm, so a very important race and very emotional because in the last two races I have some mistakes and also some bad luck with the weather.

"With this victory I could just forget a little bit these two races and look forward to keep doing what we are doing."