In 1998, Olano won his only grand tour, the Vuelta a España, fighting off furious challenges from mountain specialistsFernando Escartin and Roberto Heras as well as fellow all-rounders Laurent Jalabert and Alex Zülle, all at the height of their careers. Despite the victory, Olano was reportedly not happy with the support from the Banesto team and management. Banestos own mountain specialist José Maria Jimenez took 4 stage wins, on several occasions leaving Olano alone on the climbs, and even taking the Yellow Jersey from his team captain. Olano won back the jersey on the second time trial, but the events and subsequent media speculation soured his relationship with Banesto, and he decided for a switch to the ONCE team for the following season.