What Kipchoge needs to lower the world record

Athletics - London Marathon - London, Britain - April 28, 2019 Kenya's Eliud Kipchoge celebrates winning the men's elite race REUTERS

The die is cast. Eliud Kipchoge, the world marathon record holder, will attempt to lower the 42km all-time at the Berlin Marathon, the World Athletics Elite Platinum road race, today.

But perfect marathon conditions must prevail Kipchoge, the two-time Olympic champion who is billed as the greatest marathoner of all time.