Answer
Yes, Joshua Cheptegei set a world record in the 15km event in 2018. He set the record on 8 August 2018 in Monaco, with a time of 36:01.00. The previous record was held by Hicham El Guerrouj of Morocco, who set a time of 36:00.00 in 1998. Cheptegei's record is the current world record in the event.