The race takes place tomorrow in Nairobi.
They are choosing instead to win money on the roads.
Charles Ndirangu and Rosemary Wanjiru won the men's and women's races.
Australia's top cross-country runner will square off against Japan's best.
The Stanford grad is coached by Jerry Schumacher.
It was a banner day for Ethiopia as they captured both the men's and women's titles.
Check out these shots from over the weekend!
Competitive fields made for an exciting day of racing in St. Louis.
Olympians Matt Tegenkamp and Dathan Ritzenhein headline the men's contingent.
The 18-year-old took the lead from the beginning.