Why exactly is Geoffrey Mutai's 2:03:02 in Boston (2011) not the marathon World Record?
The course for the Boston Marathon does not meet two of the criteria necessary for ratification of world or American records:
The Boston course has an endpoint about 24.3 miles (39 km) from the start point, and the endpoint is also 459 feet (139 m) lower than the start point.
Due to the fact that the Boston course is a net downhill in excess of the limit allowed by the world record setting body.
His time is recognized as the fastest marathon ever...but not the world record.