Roddick: Federer's been my biggest obstacle

Andy Roddick says he’s hitting the ball and moving better than he has all year going into his third-round match against Roger Federer in Miami. Roddick is 2-21 lifetime against the Swiss. "We've played a ton; there's no secrets," Roddick told reporters. "I know I have to execute really, really well.  There's a small window of percentages where you have to be right.  What he does is he shrinks that window with his strengths. We have had a couple really tight ones here before at night.  I'm guessing that's when it would be.  I think we played here twice.  I won one four in the third and lost one four in the third  It's always fun…There's no getting around the fact that  he's been the biggest obstacle in my career, and his game matches up well against mine. Just the Xs and Os of it, I have to be really good to give myself a shot against him, better than against most.  So it's rewarding. When you beat a guy who's the best ever at his sport, it's a big deal."