Reigning world champion Jorge Lorenzo won the San Marino MotoGP here yesterday on a Yamaha to narrow the gap on present series leader Casey Stoner.

The 24-year-old Spaniard came home clear of compatriot Dani Pedrosa, riding a Honda, while series leader Casey Stoner of Australia, who started from pole, was third, also on a Honda.

Jorge Lorenzo (left) celebrates with Casey Stoner on the podium of San
Marino Moto GP. Pic/AFP

Lorenzo -- who celebrated by hurdling the barrier between him and his mechanics, landing in their arms -- reduced the gap between him and Stoner to 35 points.

Stoner was gracious in defeat but, worryingly, his reasons for losing suggested that he might be falling victim to a mystery illness he has had before when he complained of feeling weary.

"I didn't want to push too hard in the rain at the start and was content to sit in behind Lorenzo.

I felt comfortable just behind Lorenzo and then made an attack but when I tried to go for it I felt tired, my arms especially. I was worn out. No excuses I am just worn out after the last three races (including two in America)."