Kimetto在半程马拉松比赛中获得了他的第一次国际成功。 2011年，他在1:01:30赢得了内罗毕半程马拉松赛，然后在肯尼亚以外的地方冒险，在1:00:40在阿联酋赢得了RAK半程马拉松赛。他凭借2012年柏林半程马拉松赛的胜利，以个人最佳成绩59:14取得了这一成功。由于护照错误 – 而且因为他以前不知道 – Kimetto在2011年和2012年的部分时间被称为Dennis Koech。为了进一步扩大混乱，他的年龄被错误地列为18岁，而不是28岁，所以他在柏林59:14的胜利时间被简单地视为新的半程马拉松世界纪录。 2012年，Kimetto在柏林举办了两场比赛，比赛更加成功。首先，他以1:11:18的世界纪录赢得了25公里的BIG 25比赛，打破了Sammy Kosgei之前的世界纪录1:11:50。在赢得比赛后，他宣布他的“马拉松比赛的长期目标将成为世界纪录”，尽管他尚未参加竞技马拉松比赛。但他即将这样做。他后来首次参加马拉松比赛。一年，在柏林，并与他的训练伙伴和发现者Mutai一起跑.Kimetto继续在Mutai后面一直跑到终点线，在2:04:16获得第二名，这是有史以来最快的马拉松赛首次亮相，并且在时间，这是历史上第五快的时间。第二年，Kimetto在东京和芝加哥的马拉松比赛中取得了胜利并创下了历史记录。
Kimetto won his first international success in the half marathon. In 2011, he won the Nairobi Half Marathon at 1:01:30, then ventured outside Kenya and won the RAK Half Marathon in the UAE at 1:00:40. With the victory of the 2012 Berlin Half Marathon, he achieved this success with his personal best score of 59:14. Due to a passport error – and because he did not know before – Kimetto was called Dennis Koech for part of 2011 and 2012. In order to further expand the confusion, his age was mistakenly listed as 18 years old, not 28 years old, so his victory time in Berlin at 59:14 was simply regarded as the new half marathon world record. In 2012, Kimetto held two competitions in Berlin and the competition was more successful. First, he won the 25-kilometer BIG 25 race with a world record of 1:11:18, breaking Sammy Kosgei’s previous world record of 1:11:50. After winning the game, he announced that his “long-term goal of the marathon will be a world record”, although he has not yet participated in the competitive marathon. But he is about to do so. He later participated in the marathon for the first time. One year, in Berlin, and running with his training partner and discoverer Mutai. Kimetto continued to run to the finish line behind Mutai and finished second at 2:04:16, the fastest marathon ever. Debut, and at the time, this is the fifth fastest time in history. In the second year, Kimetto won the marathon in Tokyo and Chicago and set a historical record.