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I am really close friends with Roger Federer and also with Benoit Paire.

They are the only people in the world who I can truly trust and rely on. Touring gets really lonely. I guess I have friends around me but when you're paying them can they ever really be true friends?

I am really close friends with Roger Federer and also with Benoit Paire. I'm going out with Benoit to the restaurant for dinner and playing PlayStation with him sometimes.

I have many golfer friends whom I play with, including my good friend Ian Poulter, a professional golfer who's coming to Asia to play in a few tournaments.

My favorite tennis player, who I'm amazed by, is Roger Federer.

My best artist friend is definitely Jason Aldean. He and I really get along great and are really great friends. It's fun to tour with a buddy and somebody that I just enjoy hanging out with. If we weren't touring together, we'd be hunting in the off-season still and knocking around doing stuff, certainly.

Andy Grammer is probably the closest friend I have in the music industry, so touring with him was just incredible. He's such a soulful, kind guy, and he gives great advice. And he also scares me a lot. He does a lot of pranks.

I never had tons of friends on tour. I was quiet and went about my business.

The guys in my band are good friends on and off the stage. The band members that I have now is probably the best band that I have ever had.

Last time I was starstruck was when I met Roger Federer. He is one of the few athletes that I really look up to - incredibly talented both on and off the track and a great role model for tennis.