Jorge Mendes is an agent who doesn't live in Madrid. But it doesn't take a rocket scientist to figure out why the former semiprofessional soccer player, DJ and nightclub owner might feel that the Spanish capital is very much his town.

Mendes represents three important players at Atletico Madrid: Tiago, Diego Costa and Radamel Falcao. He also has Ruben Micael, currently on loan at Braga. And it is across town at Real Madrid where his presence is really felt. Cristiano Ronaldo, the man challenging Lionel Messi for the unofficial...