Ethiopia's Seifu Tura won the men's 2021 Chicago Marathon in 2 hours, 6 minutes and 12 seconds, before Kenya's Ruth Chepngetich dominated the women's race in 2:22:31 on Sunday (10 October).
On unusually warm conditions for this time of year, Tura was part of a thrilling three-man breakout pack, including Galen Rupp (USA) and Eric Kiptanui (Kenya), that constantly jostled for positions in the final quarter of the race.
But the Ethiopian had more to give, and kicked on from his rivals with 7km to go.
The 24-year-old, who was not selected for the Tokyo 2020 Olympic Games this summer, finally showed some emotion and celebrated the victory with his arms raised before crossing the finish line.
Local hero and 2017 winner Rupp finished +0.23 back in second, while Kiptanui held on for third.
A U.S. marathon debut to remember for Chepngetich
Women's winner Chepnegetich was simply a class above the rest on her U.S. marathon debut.
The 2019 world champion ran on her own for almost the entirety of the race, finishing 1:49 seconds ahead of Emma Bates (USA) in second, while Sara Hall (USA) rounded off the podium in third place.
Earlier, USA's Daniel Romanchuk sealed an impressive Chicago Marathon hat-rick of men's wheelchair races, breaking the tape in 1:29:07.
Marcel Hug of Switzerland finished second, with Romanchuk's compatriot Aaron Pike in third.
The women's wheelchair race went to eight-time Paralympic gold medallist Tatyana McFadden.
The American finished in 1:39:42 to claim her ninth victory in Chicago in an all-American podium that saw Yen Hoang and Jenna Fesemyer finish second and third respectively.