Biwott won two gold medals at the inaugural African Youth Championships in Warri, Nigeria in March 2013, running 1:47.01 in the 800 m and 3:41.96 in the 1500 m.[1]
In June he won the 1500 m at the Kenyan tryouts for the World Youth Championships in Donetsk, Ukraine, earning selection;[2] his time of 3:38.5 was his personal best and at that point topped the annual world youth list.[3]
Biwott won by more than five seconds in Donetsk, running successively faster laps to improve his world youth leading time to 3:36.77; the time was also a new championship record.[4]
Biwott debuted in the IAAF Diamond League at the 2014 Shanghai Golden Grand Prix and won a narrow victory in the 800 m after Algeria's Taoufik Makhloufi, the 2012 Olympic champion at 1500 m, started celebrating too early.[5] Biwott's time, 1:44.69, was a personal best by more than two seconds.[5]