Kipsang, runner-up at the Delhi Half Marathon, raced from the front right from the start to finish in 28 minutes flat, just nine seconds outside the course record of 27.51.
Compatriots Alex Korio (28:09) and Victor Kipchirchir (28:15) finished second and third, beating the Ethiopian Feyisa Lilesa to the fourth place 2012 in the IAAF Gold Label event.
Former champion and fancied name Deriba Merga finished way below in the rankings as did 25km World Record holder and pre-race favourite Dennis Kimetto who was done in by injury.
The women’s race, run in relatively hotter conditions, saw Kiprop winning in 32:22 minutes, followed home by compatriots Esther Chimutai (32:34) and Doris Changeywo (32:44). The overall winners took home $21,000 each, with the second and third-placed runners richer by $12,000 and $8,000, respectively.