While watching 2008 Aussi semis of Fed. vs. Djokovic on the TV and watching Laver vs. Roche on the computer (yes, I'm crazy) I was struck by how much faster the old grass-court game was than the modern game. With players serving and volleying, the distance between the players is much shorter (even more so when both are at the net). The old game is much quicker with players having to react and move faster. The position of the player at the net takes the time away from the opponent instead of the velocity of the ball. Though tall guys could be very successful because of big serves and reach at the net (Smith, Newcombe), smaller guys could use their quickness around the court to get to the volleys and pass, as well as get to the net quickly to volley and back to retrieve lobs. Even though there were guys in the old game 6'7" or so with big games, their effectiveness was limited by their relative lack of quickness. People these days talk about how fast the ball moves, but the game today is much slower.