Madrid is world-known for two of its professional football teams, Real Madrid (14 times UEFA Champions Leage winner) and Atlético de Madrid.
Getting tickets to watch Real Madrid matches is not easy (and certainly expensive). If you want to attend one match of the Spanish LaLiga at the Bernabéu, you should buy tickets well in advance, as tickets get sold-out fast. However, the definite date and time of the match is finally set just three weeks in advance, and could be on Saturday or on Sunday.
Another option is to try to get tickets using the secondary marketplace onlineticketexpress.com or the ticket resale site Viagogo (see Wikipedia page on Viagogo).