Defending champions Hellen Obiri and Sisay Lemma are returning to run Boston Marathon

The BAA heralded its elite field, which will include 21 men with sub-2-hour-9-minute times and 17 women who have run under 2:23. “Defending a win is never easy, and to win the Boston Marathon twice in a row was hard, but I am happy to have done it,” Obiri said in a release from the Boston Athletic Association. “On race day I will again push for the win and hope to make it three in a row.” The reigning women’s and men’s Boston Marathon champions will return to the Hopkinton...