The 19 - year - old Chebet clocked 8 : 59.75 .
The 19 - year - old Chebet improved her own African record by 0.16 seconds but missed the world and Olympic record by 0.96 seconds .
The 19 - year - old Chebet clocked 8 : 59.75 and improved her own African record by 0.16 seconds but missed the world and Olympic record by 0.96 seconds .