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. The 37-year-old has now run three of the four fastest marathons in history and has ambitions to win a record-breaking third consecutive Olympic gold at Paris 2024. “I think I am happy to run a course record here in Tokyo,” said Kipchoge, who joined a se…