It will be Ethiopia versus Kenya in the men's and women's divisions.
The Ethiopian won her second Olympic 5,000m title -- 8 years after the first.
He is the man to beat at the Olympics
One journalist spent six months in the East African country looking for the answers.
The Diamond League season kicks off on May 11 in Doha.
She came in sixth overall with little preparation.
He faced difficult conditions in the early part of the race.
She will be running the 3000m event.
The race was closer than expected.