The former New York City Marathon champion hasn't raced in nearly a year.
“I will always be running, running is my life."
Both athletes plan to qualify for the 2012 Olympics there.
Haile Gebrselassie, Paula Radcliffe will both be on the starting line.
She's is racing in the German capital to qualify for the 2012 Olympics.
The course is one of the fastest in the world.
He has won the race on four occasions has and set the world record twice there.
He immigrated to Canada penniless.
He had planned on racing a 10K on Sunday.
He hopes to represent his country at the World Championships in March.