Sara Hall of Flagstaff runs second fastest U.S. marathon, Martin Hehir breaks 2:09 at The Marathon Project in Chandler

In her first marathon, Molly Seidel made the Olympic team. In her second, she became the ninth-fastest American woman ever at the 26.2-mile distance.

Annalise Murphy says her temporary switch from dinghy sailing to the Volvo Ocean Race is "like Usain Bolt stepping up to ultra-marathons" - but she insists that spending 12 months away from her specialist discipline won't harm her push for Olympic gold at Tokyo 2020.