Jackie Stewart led the Monaco Grand Prix all the way, giving him a 14 point lead in the 1971 world driver's championship, at Monte Carlo.
It was an almost faultless performance, but it was nearly overshadowed by Ronnie Peterson's brilliant drive to second position.
Stewart took pole by 1.2 seconds and lined up ahead of Jacky Ickx while the BRM of Jo Siffert started on row two alongside Chris Amon's Matra.
Amon, perennially unlucky, was in trouble before the start and was unable to take his place on the grid. He did start but retired after 45 laps with transmission failure.
At the front, Stewart took the lead at Ste Devote, the first corner, and led the quick-starting Siffert and then Ickx. Behind them, the Brabham team was in disarray as Graham Hill crashed out on lap two while his team-mate Tim Schenken also clouted something solid when he tried to avoid a spinning Tyrrell of Francois Cevert. The Australian continued to finish in 10th place. Cevert wasn't so lucky and continued for just two more laps until his engine cut out and he crashed as a result.
While Stewart was clearly in a class of his own, it was the young Ronnie Peterson, in just his second season, who provided the action further down the field. He raced from eighth on the grid to second, passing Jacky Ickx and Jo Siffert in the process on the tight and twisty confines of Monaco.