Overview
- Alex Aranburu won Stage 4 in Galdakao from a long breakaway.
- Paul Seixas placed eighth, 14 seconds back, riding calmly with help from Matthew Ricctello and Léo Bisiaux before forcing a gap on the final descent.
- His overall lead grew to a little over 2 minutes 15 seconds on Primoz Roglic, with two stages still to race.
- The 167.2 km route circled Galdakao with eight climbs and early-season heat that wore down the pack.
- The race lost major threats as Isaac Del Toro abandoned after a crash and Juan Ayuso withdrew with stomach problems.