Input (grade 5): He holds seven Grand Slam titles: men's doubles in the 2000 and 2002 US Open and 2005 and 2006 French Open; and mixed doubles in the 1998 and 2007 U.S. Opens and 1998 Wimbledon.
Output (grade 6): A doubles specialist, he holds seven Grand Slam titles: men's doubles in the 2000 and 2002 US Open and 2005 and 2006 French Open; and mixed doubles in the 1998 and 2007 U.S. Opens and 1998 Wimbledon.