Defending champion Jorge Lorenzo extended his lead in the MotoGP standings to 10 points after a dramatic victory at the Italian Grand Prix.

The 29-year-old Spaniard, who leaves Yamaha at the end of the season to join Ducati, held off compatriot Marc Marquez by 0.019 seconds in Mugello.

Local hero Valentino Rossi, who was on pole, encountered a mechanical problem on lap eight and soon retired.

The Italian, 37, is now 37 points behind Lorenzo with 12 races remaining.

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