In 2011, Geoffrey Mutai blistered the Boston course in an epoch-defining 2:03:02. For this year’s race, the course was simply blistering. At 10am, when the elite men’s field was all set to go, the temperature on the Hopkinton starting line was 79.2 degrees. At the half way mark it had inched above 82. By the finishing line it was 84.8. Last year, it was all about the hot pace. This year it was just plain hot.