別府大分毎日マラソン
His first major marathon competition came in 2006 at the Prague International Marathon and he finished second behind Hassan Mubarek Shami in a time of 2:11:42. Working with top Italian distance running coach, Claudio Berardelli, he improved his best in his second outing at the Italian Marathon and defeated David Makori in a sprint finish to the line to win his first race. Kiyeng began his 2007 season at the Beppu-Ōita Marathon but his time of 2:11:26 left him third place, finishing after the Japanese opposition of Atsushi Fujita and Atsushi Sato. He improved further at the Reims Marathon later that year, however, recording 2:09:08 to win the French race.