Two-time Olympic champion Eliud Kipchoge has broken his own marathon world record by 30 seconds with victory in Berlin.The 37-year-old Kenyan, who has now won 15 of his 17 career marathons, including two Olympic triumphs and 10 major titles, was in a class of his own, setting a blistering pace along the flat, fast inner-city course from the start on an overcast day.Only a handful of runners could keep up with Kipchoge along with the group of pacemakers.He gradually shook off last year’s winner Guye Adola but fellow Ethiopian Andamlak Belihu refused to buckle, even as they raced through the halfway mark in less than an hour.Kipchoge is the only man to run a sub-two hour marathon when he clocked on a specially designed track in Vienna in 2019 but the time is not officially recognized as it was not set in competition.