Chicago Marathon 2023 was announced as a World Record tentative, but not from Eliud Kipchoge, but from Kelvin Kiptum, a 23 year young prodigy from the same Kenya. Well, Kelvin Kiptum already amazed in Valencia and London, where he run his first and only marathons, in 2:01:53 and 2:01:25 respectively. Two of the fastest five…