Both the men's and women's marathon world records were set in Chicago, by Ruth Chepng'etich (2:09:56) last year and by the late Kelvin Kiptum (2:00:35) in 2023. While Kiptum's mark will likely stand for a long time yet, John Korir triumphed in the Windy City 12 months ago by clocking in the eighth-fastest marathon of all time — can he break 2:02 this weekend?

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The 2025 Chicago Marathon takes place on Sunday, October 12. Full schedule below. • Time: 8:20 a.m. ET / 5:20 a.m. PT / 1:20 p.m. BST / 11:20 p.m. AEDT • FREE STREAM — YouTube / NBC Chicago (U.S.) • FREE STREAM — Olympics.com (select countries) • Watch anywhere — Try NordVPN 100% risk free

Korir backed up his Chicago victory by winning Boston in

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