Hailing from
Bomet in Kenya's
Rift Valley Province, Cheruiyot's international debut was at the 2008
Frankfurt Marathon. In 2009, Cheruiyot finished fifth at the
Alphen aan den Rijn and followed it up with a fifth-place finish at the 2009
Boston Marathon six weeks later with time of 2:10:06. In the fall, he returned to Frankfurt to defend his title. He turned in a time of 2:06:23, a new personal best, and finished second. The weather for the race was excellent – high 40s with a headwind of . He returned to defend his title at the
2011 Boston Marathon and although his time of 2:06:43 hours was comparatively quick, he came sixth and was over three and a half minutes behind winner
Geoffrey Mutai. His second race of the year came at the Frankfurt Marathon, but again he was out of contention and finished fifth with a time of 2:06:29 hours. Cheruiyot lives and trains with accomplished marathoner
William Kiplagat, who also serves as his coach. Robert Kiprono Cheruiyot is a member of the
Kipsigis tribe, whereas Robert Kipkoech Cheruiyot is from the
Nandi tribe. == Personal bests ==