Sierre-Zinal, the Race of Five 4,000s, returns for its 53rd edition. The 31-kilometer race starts in Sierre and finishes in Zinal, gaining and losing elevation.

The course record for men is 2:25:34 by Kilian Jornet, while Maude Mathys holds the women’s record at 2:49:20. Winners receive prize money and bonuses for new records. Read more everyday miles coverage.

Kenyan Philemon Kiriago leads the men’s field, with strong competition from Morocco’s Elhousine Elazzaoui and Switzerland’s Adrien Briffod. Caroline Kimutai defends her women’s title against Maude Mathys and Mădălina Florea. Related: Ingebrigtsen's Comeback and Key Races at European Championships.

This original Runner World brief is based on reporting from Marathon Handbook. Visit the source for its complete reporting, context and any later corrections.