After reading the November/December issue of Tennis Magazine, I came across a rumor/legend that Bill Tilden served up a bomb at 163.3 mph. Maybe it happened, and maybe it didn't. My curiosity is to how in the world they could have clocked it at that speed with the technology that they had in 1931. I'm not even here to discuss today's technology in sticks versus old time. What I am curious about is how they came up with that figure/number with the technology they had back then in tracking speeds of tennis balls. Any thoughts into this or links to factual data concerning this amazing urban legend????