Besides the huge first serve, he's actually improved his...

Besides the huge first serve, he's actually improved his service games. Last year, he finished sixth in first-serve percentage, which is unheard-of for a guy with that big a serve. Andy did a much better job of mixing his first serve, not always trying to hit the 140 or 150 mph serve. He can do so much with it, in terms of the kick serve, moving it around a little bit more. ... It's going to help him get a higher percentage of first serves in, and it's going to be tougher for guys to break him.