Atlético de Madrid

From BR Bullpen

Atlético de Madrid is a prominent Spanish soccer club in Madrid. They won Spanish baseball titles in 1949, 1951 and 1952 - their last championship matched Real Madrid (another organization known mostly for soccer) for the most in Spain's history, though Real Madrid passed them in 1955, as have many others. Atlético de Madrid no longer fields a baseball team.

Source: Baseball in Europe by Josh Chetwynd