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The correct answer for the question is option 2, Rafael Nadal.
Option 1, Novak Djokovic, is not the correct answer. while Novak Djokovic is a highly accomplished tennis player, he did not win the Men`s Singles title at the Madrid Open Tennis Tournament in 2013.
Option 3, Roger Federer, is also not the correct answer. Roger Federer is considered one of the greatest tennis players of all time, but he did not win the Men`s Singles title at the Madrid Open Tennis Tournament in 2013.
Option 4, Stanislas Wawrinka, is not the correct answer either. Although Stanislas Wawrinka is a talented player who has won multiple Grand Slam titles, he did not win the Men`s Singles title at the Madrid Open Tennis Tournament in 2013.
Therefore, the correct answer is option 2, Rafael Nadal. Rafael Nadal is a Spanish professional tennis player and one of the most successful players in history. He won the Men`s Singles title at the Madrid Open Tennis Tournament in 2013.