Movistar won the team time trial in the opening stage of the Spanish Vuelta on Saturday, making Jonathan Castroviejo the race leader.
The 10.25-mile ride ending in Pamplona's famous bull ring also marked Alberto Contador's first competition in front of his home fans since serving a doping ban.
Castroviejo led Movistar across the finish line in 18 minutes, 51 seconds. Rabobank, Omega Pharma Quickstep and BMC were next.
Team Sky was fifth with Christopher Froome, while Contador's Team SaxoBank was seventh.
Contador returned to competition earlier this month after serving a ban for taking the stimulant clenbuterol during the 2010 Tour de France.
Sunday's second stage is a 112-mile ride from Pamplona to Viana.