Ayana may not have earned Olympic gold in the 5,000, but she was utterly dominant apart from that, breaking 14:20 three times in 2016 (before this year, it had been done six times, total). U.S. #1 was a tough choice as Shannon Rowbury earned 3k bronze at World Indoors and set the American 5k record while Molly Huddle crushed everyone in the 5k at the Olympic Trials.

The men's 800 (Rudisha vs. Amos Rematch + Berian and Loxsom) and mile (Kiprop vs. Souleiman as Centro, Leo and Blankenship try to go sub-3:50) are the crown jewels of the Saturday action. Other action includes Molly Huddle vs. Mercy Cherono in the 5,000, Eunice Sum vs. Brenda Martinez in the 800 and an African showdown between Isaac Makwala (#5 all-time) and Wayde van Niekerk (#11 all-time) in the 400.

Kenya and Ethiopia have gone 1-2 in the women's race at 18 of the last 19 championships and appear likely to do so again in 2015. Can defending champ Emily Chebet of Kenya rebound from a 14th-place finish at the Kenyan Trials to claim her third World XC title?

Genzebe Dibaba and Molly Huddle take the #1 World and US spots.