Last year at Boston it came down to Rupp vs. Kirui. Now the two terrific marathoners are primed for a rematch

Last year, Geoffrey Kirui of Kenya and Galen Rupp were dueling at the end of the Boston Marathon, with Kirui pulling out the win. A year later, each probably is even stronger going into a rematch. My story for ESPN.com: http://www.espn.com/olympics/story/_/id/23028527/2018-boston-marathon-rematch-runners-geoffrey-kirui-galen-rupp-boston-two-fastest-men-last-year