Career
Koren turned professional in 2010. Born on 25 November 1986, in Postojna, Slovenia, Koren resides in Budanje, Slovenia. Koren turned professional with Liquigas–Doimo, a UCI ProTeam, in 2010.
He remained with Liquigas–Cannondale for the 2011, 2012, 2013, and 2014 seasons.
Koren signed with Cannondale–Garmin, a UCI ProTeam, for the 2015 season.