Former half-marathon world record-holder receives four-year doping ban Abraham Kiptum of Kenya set a new world record in the half-marathon with his 58:18 performance at the Valencia Half-Marathon in October 2018 that was broken by Geoffrey Kamworor at this year’s Copenhagen Half-Marathon. When Kiptum announced he would race the London Marathon in April, much was made of the fact that he’d been turned down by the Chicago Marathon despite having a personal best of 2:05. However the Athletics Integrity Unit announced…