More on Jack Kramer. In my time I have played against many players with great serves. Probably the greatest was Jack Kramer, who hit the ball very hard (his service was timed at 110 mph) and was extremely accurate and deceptive. Frank Sedgman is another good server, with a consistently hard first service which he follows with tremendous speed in to the net to volley away winners. Lew Hoad has a hard and deceptive service that has always presented me with difficulty. Barry MacKay, because of his height, can send down balls at terrific angles and has great power. However he usually directs his service to the backhand, and though it travels at high speed, it is not as difficult to handle as the more deceptive services of Kramer and Hoad. Bobby Riggs was a small player, but he accurately served to the corners, pulling his man out of court. Another hard and baffling server was the Czecholslovakian-born left-handed, Jaroslav Drobny, now a naturalized Briton.---From the Fireside Book of Tennis and the article "The Serve and How to Vary it" by Pancho Gonzalez. In an average match, 50 percent of points are won by serve, the rest by volleys and ground strokes. There admittedly are traps in making such generalizations. A person like Kenneth Rosewall might win only one point a game on his serve, and the rest by volleys and ground strokes. On the other hand, I might win three points a game with my serve and only one with volley and ground strokes.---From the Fireside Book of Tennis and the article "The Serve and How to Vary it" by Pancho Gonzalez. If I had to choose the best service I ever encounted, it would be a toss-up between Gonzalez's and Kramer's. I never saw Ellsworth Vines, but I believe his delivery was on the same level.---From the Fireside Book of Tennis and the article "The Service" by Frank Sedgman.