Fernando Alonso defeated team-mate Lewis Hamilton and reasserted himself as the McLaren team leader after taking an important victory in Monaco.
Out-qualified by Hamilton, Alonso made a better start and led the bulk of the 78 lap-race as Hamilton had cause to thank McLaren for building a sturdy car, brushing the barrier on a number of occasions but getting away with it without any damage.
The McLarens were unstoppable and both drivers lapped quicker in the race than they had in qualifying. A distant third was Felipe Massa's Ferrari. "Even if I had pushed 150 per cent it would have changed nothing," said the frustrated Brazilian post-race. Massa and Ferrari tried to change strategy by changing to extra-soft tyres but traffic, a constant Monaco problem, was the undoing of Massa's attack.
Giancarlo Fisichella took a morale-boosting fourth for Renault ahead of Robert Kubica's BMW Sauber and the sister car of Nick Heidfeld. The Williams of Alexander Wurz, in his comeback season as a race driver after years of testing, finished seventh ahead of Kimi Raikkonen's Ferrari. The Finn was 16th on the grid after a crash in qualifying but raced well around the Principality to secure the final point.