Anderson has a huge serve. But earlier he used to stay right behind after serving even though he doesn't have the baseline depth to beat guys like Wawrinka from the back of the court. In this match (and I don't know if he has been doing that in his 3 other wins over Wawrinka too), he serve-and-volleyed a lot. In fact the highlights package looked more like a 90s match, because players only use S&V occasionally these days, not so very often as Anderson seemed to be. He pulled off some surprisingly good volleys too. Queens looks kickass this year, hopefully a good indication of how Wimbledon will play as well.