Announcement comes on same day that three Kenyan marathoners get banned for doping.
He DNF'd there in 2012.
It's now the sixth event in the series.
Forty thousand runners signed up in three-and-a-half hours.
He won thie race n 2003 and 2007.
The fastest marathoner of all-time misses world-record.
She is hoping for better weather than she had two years ago.
We caught up with the world's fastest marathoner, who returns to the roads this weekend in Berlin.
She is looking to dip under 2:20.
The fastest marathoner of all-time will square off against a stacked field.