Mo Farah placed eighth in his full marathon debut but vowed to run another one.
Two of the top Kenyans square off Sept. 29 in the German capital.
The American running legend will run Sunday's half-marathon in southern California.
The Olympic silver medalist will also be running the London Marathon.
Two of the fastest marathoners in the world will do battle in the Windy City this October.
She admits her marathon training has gone well.
A repeat win will not be easy next year.
In the women's race, Florence Kiplagat ran under 2:20.