The problem is that with the slowdown of the surfaces, the slowdown of the tennis balls (diameter larger) and the new technology (tennis rackets) led the game to a real marathon. Who errs less win, not who make more winners. Before being a tennis players, you have to be a marathon man. The tennis has existed for 100 years, serve/volleyball players have always existed, but unfortunately they have disappeared in the last 5-6 years because of this exaggerated and absurd slowdown of the surfaces and the rest. The last AO was played on a surface so slow (slower than RG) and with tennis balls so slow that finally the circuit begans to complain about (finally!!).