history: I think Rafael Nadal is the best tennis player of all time. What do you think?
knowledge: Nadal has won 16 Grand Slam singles titles, 30 ATP World Tour Masters 1000 titles, 19 ATP World Tour 500 tournaments, and the 2008 Olympic gold medal in singles.
response: Oh Nadal?  Well he's won a lot of titles, tournaments and medals.
history: I think Rafael Nadal is the best tennis player of all time. What do you think?
Oh Nadal?  Well he's won a lot of titles, tournaments and medals.
What do you think was he's best grand slam victory ever?
knowledge: Known as ''The King of Clay'', he is widely regarded as the greatest clay-court player in history.
response: I don't know!  I do know that he is widely considered to be the greatest clay court player ever.
history: I think Rafael Nadal is the best tennis player of all time. What do you think?
Oh Nadal?  Well he's won a lot of titles, tournaments and medals.
What do you think was he's best grand slam victory ever?
I don't know!  I do know that he is widely considered to be the greatest clay court player ever.
Who do you think is he's greatest adversary?
knowledge: He is the second male player, after Andre Agassi, to complete the singles Career Golden Slam.
response: I'm not sure.  Oh did you know that he was the second to complete the Career Grand Slam in singles?  Andre Agassi was the first to do so.
history: I think Rafael Nadal is the best tennis player of all time. What do you think?
Oh Nadal?  Well he's won a lot of titles, tournaments and medals.
What do you think was he's best grand slam victory ever?
I don't know!  I do know that he is widely considered to be the greatest clay court player ever.
Who do you think is he's greatest adversary?
I'm not sure.  Oh did you know that he was the second to complete the Career Grand Slam in singles?  Andre Agassi was the first to do so.
What about Federer? He and Nadal seem to be Neck and neck.
knowledge: Federer has won 20 Grand Slam singles titles, the most in history for a male player and has held the world No.
response: Oh Federer?  He won the most Grand Slam single titles for men, ever.  20 of them!