Kenya’s double Olympic champion Eliud Kipchoge said he would aim for “one thing at a time” after narrowly failing to beat his own world record in a dominating performance at the Tokyo marathon on Sunday. Kipchoge won the race in 2hr 2min 40sec, the fourth-fastest time in history, to give him victories in four of the world’s six major marathons. But Kipchoge was unable to beat the 2:01.39 he clocked at the 2018 Berlin marathon, hindered partly by a wrong turn around the 10-kilometre mark that cost him valuable seconds. The 37-year-old has now run three of the four fastest marathons in history a…