Rafa is mad about Real Madrid, who advanced to the final. (Twitter/Troll Tennis)

Though both top stars had third-round matches to play at the Madrid Open the next day, Novak Djokovic and Rafael Nadal took time to watch Real Madrid take on Manchester City in the UEFA Champions League semifinals Wednesday night at the famed Santiago Bernebau stadium.

Dressed for an evening on the town, they looked downright chummy:

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Their siblings also benefited, as Marko Djokovic (a player in his own right) and Maria Isabel Nadal got to tag along. Everyone was excited to be there—Nadal even more so, since he's a big fan of Real Madrid, which won the game 1-0.

An obligatory humblebrag followed, with Djokovic tweeting about his meeting Brazilian soccer legend Ronaldo:

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The two buddies can't face off until the Madrid final.