At the
2013 IAAF World Cross Country Championships, he finished 15th in the
senior men's race. It was his third marathon. Kirui participated in the
2017 World Championships held in London, winning the gold in the
Marathon, with a time of 2:08:27. In 2019, he competed in the
men's marathon at the
2019 World Athletics Championships held in Doha, Qatar. He finished in 14th place. ==Personal bests==