|Ethiopia's three-time Olympic gold medallist|
Kenenisa Bekele will take on a formidable Kenyan challenge spearheaded by Eliud Kipchoge in Sunday's Chicago Marathon, with a course record in their sights.
Kenyan Dennis Kimetto set the Chicago Marathon record of 2hrs 03.45sec in winning last year, but he won't be back to defend his title.
Even without Kimetto the men's elite field boasts plenty of firepower, with five entrants who have run under 2:06.
Kipchoge is another track to road convert and has made no secret of the fact that the marathon world record is something he'd like to achieve, but he says he won't be putting pressure on himself to achieve the aim just yet.
"It is something we are not dwelling on so much since this is my fourth marathon," he said. "It is also my first time in the USA."