Michael Schumacher was left frustrated with another failure to score in Monaco after the seven-time champion logged his fourth DNF of the season in the principality.

Schumacher had led the way in qualifying but had to start from sixth place on the grid as a result of the five-place penalty imposed for his collision with Bruno Senna in the Spanish Grand Prix.

Lucky to escape contact with Romain Grosjean on the run to turn one when he was squeezed towards the barrier by the Lotus man, Schumacher looked well placed to pick up his best result of the season before a fuel pressure issue halted his challenge and forced him into retirement.

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"What can I say?" he said afterwards. "It was simply a pity to end the race in this way. In any case, the fuel pressure problem had nothing to do with the incident at the start. But it made it doubly disappointing because I had secretly been hoping for a podium finish today.

"I will take the boost from the high points of this weekend with me to Canada. The track should suit us and I'm hoping to have a normal, clean race."

With Nico Rosberg on the podium, it was very much a mixed race for Mercedes, with team boss Ross Brawn insisting that team need to eradicate the issues it is still suffering before the next race in Montreal.

"Nico ran a very good race today and did all he needed to do," he said. "I think we made the right calls but nothing opened up for us. It was a race that was about managing gaps and finding the right windows in the traffic; the team did a great job on that. Nico was the first of the front-runners to stop, but the harder tyre took a lap or two to come in and it wasn't enough to jump Mark.

"As for Michael, he was hit on the run to the opening corner which cost him positions, but was very quick when a fuel pressure problem started to slow him later in the race. We tried to continue but it was costing him too much time, dropped him out of the points and forced us to retire the car. It was very disappointing because he put in a great performance this weekend and he was still on course to score useful points. We need to make sure we eliminate the problems for him, starting in Canada."