Forty thousand runners signed up in three-and-a-half hours.
The fastest marathoner of all-time misses world-record.
Two of the fastest marathoners in the world will do battle in the Windy City this October.
Geoffrey Mutai and Mary Keitany will lead the charge.
Scenarios abound in the determination of the men's winner.
The London Marathon champ has a penchant for mobile phones.
WMM contenders Gebremariam, Kiplagat lead respective fields in Daegu, Korea.
The World Marathon Majors trophy will be named after him.
So you think you know a lot about running?
Boston, London races will likely reshuffle the WMM leaderboard.