On average, the men's winning time is 4 minutes and 28 seconds faster than the women's but the women will get a 10 minute head start as the roads are too narrow for both to finish at once. Once the lead women finishes, a clock will start counting down from 5:32 and if a man finishes before then, he gets the money. If not, the women's winner gets an extra $5000.
Her dad Steve Spence, the World Championship marathon bronze medallist in 1991, raced it twice and was second in 1988.
Defending champion Stephen Sambu and 2-time winner Micah Kogo lead men's field that has Chris Derrick, Meb Keflezighi, Abdi Abdirahman, Sam Chelanga and Moses Kipsiro. The women are lead by Amy Cragg, Diane Nukuri, Sara Hall, Neely Spence Gracey and Alexi Pappas.
Women's field led by Morgan Uceny, Gabe Grunewald and Katie Mackey.