Why Berlin Marathon is ideal race for men’s world record: Olympic champion Kipchoge faces tough battle in German city from Kipsang and Bekele tomorrow

ATHLETICS-GBR-MARATHON (L-R) Kenya's Eliud Kipchoge, Kenya's Dennis Kimetto, Kenya's Stanley Biwott and Kenya's Wilson Kipsang pose for photographers near Tower Bridge in central London on April 20, 2016 during a photo call ahead of the London marathon. The 2016 London Marathon is set to take place on April 24, 2016. / AFP PHOTO

Dennis Kimetto’s record set in 2014 will come under threat as top marathoners battle for glory.

This year’s BMW Berlin Marathon is the latest race to be billed a ‘showdown of all ages.’