Courtney Olsen and Charlie Lawrence, both American, win the IAU 100k 2026 world championships in Ames, Spain. The race is contested over twenty 5 km laps, and Olsen clocks 7:10:31, taking the lead from the Japanese runner Miho Nakata on the 17th lap, after having led for a long time.
Olsen finishes with just over a minute’s advantage over Nakata, while the men’s outcome follows a different dynamic. Lawrence takes the lead just before halfway, then stays ahead of the Lithuanian runner Aleksandr Sorokin “for the rest of the race”. He crosses the line in 6:09:25.
The event marks the 33rd edition of the championships and the 100 km is presented as “the jewel” of the IAU. The biennial meeting took place in December 2024 in India. The participants come from 44 countries, with 147 men and 102 women at the start.
The start is at 8:30 a.m. (European Central Summer Time), on Sunday 20 September. Skies are clear, with temperatures ranging from 16 °C in the morning to 32 °C at the finish. The course alternates between roads and cycle paths, sometimes through woodland, sometimes in the town, incorporating local landmarks.
The course is described as a loop of 20 laps: a first lap of 4.8 km, then 19 laps of 5 km, with two 100-metre transition zones. The women start at the same time as the men, and Nakata with Satu Lipiäinen quickly settle into the top two spots, 15 seconds clear of the rest of the pack from the very first lap (20:05).
On the men’s side, Masato Tanaka takes the lead on the opening 4.8 km, with a nine-second advantage over Charlie Lawrence and Aleksandr Sorokin from the second. At the end of the first lap, the gap reaches 39 seconds, and it widens to 73 seconds after one more lap.
