Kelvin Kiptum breaks a world record in his U.S. marathon debut
The self-coached 23-year-old runner from Kenya beat two-time Olympic champion Eliud Kipchoge's previous world record by 34 seconds at the Chicago Marathon.
The self-coached 23-year-old runner from Kenya beat two-time Olympic champion Eliud Kipchoge's previous world record by 34 seconds at the Chicago Marathon.