ANCHORAGE, Alaska — It could have been mistaken for the finish of a sprint final — except for the fact that almost 10 skiers were in the hunt until the end, most of which were distance specialists. As it were, the last 100 meters of the men’s 30-kilometer classic mass start at 2018 U.S. Cross Country Championships on Sunday involved eight men double poling in four lanes. Two of those men were past national classic-sprint...