World silver medallist Mutai set a new course record in the men's event, clocking up a time of two hours four minutes 39 seconds, the fifth-fastest time in the history of the event.
That beats the 2:05:10 record set by compatriot Samuel Wanjiru in 2009, with Mutai going one better than last year having been runner-up in 2010.
Mutai, 26, bided his time amongst a tight bunch before the second of the two pacemakers dropped out after 30 kilometres, allowing the Kenyan to surge ahead to the finish line.
Three-time winner Martin Lel and Patrick Makau made it an all-Kenyan top three with Lel just edging out his compatriot in an exciting sprint finish.
Keitany wins
In the women's event, Keitany finished ahead of defending champion Liliya Shobukhova.
The 29-year-old clocked an unofficial time of two hours 19 minutes and 17 seconds, with Russian runner-up Shobukhova nowhere in sight, while Keitany's compatriot Edna Kiplagat finished third.
There was no catching Keitany, though, who took control after the half-way point to beat her personal best, some ten minutes faster than her marathon debut in New York last year.
Earlier in 2011, Keitany set a new world record of 1:05.50 for the half-marathon, becoming the first woman to run under 66 minutes, and she is proving a force at double the distance, having also finished third in New York.
Meanwhile, Britain's Jo Pavey finished 19th with a time of 2:28.23 in an excellent marathon debut, well within the qualifying mark for the Olympic Games next summer.
A latecomer to the scene, the 37-year-old is expected to concentrate fully on competing in marathons rather than returning to track and field.
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