The 10K de Castro Urdiales is a 10-kilometre road race held in Castro Urdiales, organized by Club Correcastro. Runners begin at Parque Amestoy in the morning. The event attracts over 500 athletes, and the competition at the front can be intense. In one past edition, four men reached the halfway point together, with the winner decided in the final kilometre.
The course is exposed to the elements, and heat and strong south winds have impacted runners in previous races. A tradition involves inviting a well-known athlete as the event patron; double world marathon champion Abel Anton served in this capacity and received a trophy from Club Correcastro president Jose Mari Uncilla. Olympic medalist Jose Manuel Abascal was the announcer. Andoni Acebedo won the race, breaking away with one kilometre remaining to finish in 31:56, closely followed by Rodrigo Senovilla in 31:58 and Diego Pascual in 32:03.