What You Need to Know About the Chicago Marathon Chicago Marathon, Runners World 2020 Calendar to shatter Paula Radcliffe’s previous world record of 2:15:25. Radcliffe’s mark had stood since 2003, and was thought to be untouchable—when Kosgei started her world-record run, the second fastest women’s marathon in history was 2:17:01.

Just how fast is the new women’s world record? How long could you run at Kosgei’s average pace? Here are a few fun facts in the wake of Kosgei’s mark.

Chicago Results

  1. Kosgei’s average pace per mile: 5:06.8
  2. Kosgei’s average pace per 5K: 15:53.2
  3. Kosgei’s average pace for one lap of a 400-meter track: 76.25 seconds
  4. Kosgei’s first and second half marathon splits, respectively: 66:59 and 67:05
  5. U.S. women’s half marathon record (held by Runner’s World contributing writer Molly Huddle): 67:25
  6. Date the men’s world record became faster than Kosgei’s time: June 13, 1964 (2:13:55, by Basil Heatley of Great Britain)
  7. Fastest Marathon Runners Kosgei to go from 35K to the finish: 22:50
  8. Fastest Marathon Runners defending men’s champ Mo Farah Other Hearst Subscriptions: 23:35
  9. Fastest Marathon Runners: 4:06
  10. Time it took men’s winner Lawrence Cherono: 4:13
  11. Time by which the women’s world record has fallen since Kosgei was born on February 20, 1994: 7:02
  12. Kosgei’s age when Radcliffe set the previous world record: 9

[From training tips, to fueling strategies, to improving the mind-body connection, the Runner's World 2020 Calendar will help you run your best all year long.]

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Scott Douglas
Contributing Writer
Scott is a veteran running, fitness, and health journalist who has held senior editorial positions at Runner's World and Running Times. Much of his writing translates sport science research and elite best practices into practical guidance for everyday athletes. He is the author or coauthor of several running books, including Running Is My Therapy, Advanced Marathoning, and Meb for Mortals. Scott has also written about running for Slate, The Atlantic, the Washington Post, and other members of the sedentary media. His lifetime running odometer is past 110,000 miles, but he's as much in love as ever.