Andy Roddick is currently ranked the 6th best tennis player in the world.
He's the American number one and is hoping to get into his third Wimbledon final this year.
Sportsround and tennis fan Scott caught up with him and put some tough questions to him in this exclusive interview.
You can watch the next Sportsround at 6.10pm on Friday on the CBBC Channel.
If you miss it, or really liked it the first time, you can catch it again at 8.15am on Saturday on BBC2.