Defending MotoGP World Champion Jorge Lorenzo kept his head in difficult conditions to take his first victory of the 2011 season at Jerez in what was a wet - and at times wild - Spanish Grand Prix.
All riders started on Bridgestone's wet weather compound but managing tyres became tricky as track conditions changed throughout the race.
The Spaniard held on to cross the line ahead of Nicky Hayden after what was a very dramatic race which saw Australia's Casey Stoner crash out after an altercation with Valentino Rossi.
"Some bikes save the tyres a little more, and also the way you ride the bike, so I was very concentrated to save the tyres because we knew it would be tough from the beginning," Lorenzo said.
"To watch some others crashing and keep the concentration is not so easy, and such a long race, but we kept on the bike and we won for the second time here in Jerez."
Sunday's rain meant that the morning warm-up and the race were the very first wet sessions of running this season, presenting the teams and riders with the task of deciding their wet setups with only 20 minutes of warm-up track time.
"I think everyone who watched the race will agree that it was very dramatic indeed with so many changes of position throughout the whole field," said Hiroshi Yamada - Manager, Bridgestone Motorsport Department.
"Such conditions are always very difficult, for the teams, the riders and for our tyres, but Jorge rode a very mature and consistent race to cross the line first so I must congratulate him and the Yamaha team."
Stoner was an angry man after the race after an ill-timed overtaking manoeuvre by Rossi threw both riders from their bikes. The Australian wasn't just angry at the Italian - the race marshalls also came in for scrutiny after helping Rossi re-mount his bike while offering no help to Stoner.
"With the accident, I heard Valentino arriving and I wasn't worried about anyone passing me at that point in the race so I gave him plenty of room," Stoner said.
"It was a racing incident and there's not much we can do. What is more frustrating is the reaction of the stewards and their assistance for Valentino and not for me, it was unbelievable."
The teams now travel to Estroril for the Portuguese Grand Prix on May 1st.
1 Jorge Lorenzo (Sp) Yamaha 45 pts
2 Dani Pedrosa (Sp) Honda 36
3 Casey Stoner (Aus) Honda 25