-The height of the net has changed many times, however, in 1892 it was decided that the height shall be 3ft 6 inches and 3ft at the center which it is today. -The pressure in tennis balls has been reduced and the size of tennis balls has increased to take away some of the advantages derived from modern rackets, which enables players to generate tremendous power without extra physical effort. - In past tennis, they decided to count by increments of 15, 30, 45 but today's scoring is 15, 30, 40. Historians agree that it was just a faster way of saying it.
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The rules were the tennis ball would be bounced three times before serving. It was also against the rules to use the racket to hit the ball. Hope this helped. Istead they liked using chicken cocks and the balls were made out of peasants sacks.