Are you going to the Davis Cup finals?

You can travel there by underground.  Alto de Extremadura station is very close to Madrid Arena

The Davis Cup finals will be held in Madrid from 25 November to 5 December. To encourage fans to travel by underground to the multipurpose Madrid Arena pavilion, Metro de Madrid has decorated a train that runs on Line 6 (circular line) with pictures of some of the players and the flags of the countries taking part in the finals of this international competition.

Alto de Extremadura is the nearest station to the event venue, located 500 metres away (some six minutes walking). This train will run for two weeks, with pictures referring to the six national teams participating in the Davis Cup: Spain, Sweden, Canada, Ecuador, the Russian Federation and Kazakhstan. Each carriage of the train will represent one of these countries and will include pictures of some of their players.