Why is tennis scored 15, 30, 40 rather than the more traditional 1 pint, 2 points, 3 points of other sports? August 17, 2017 By Show answer In its early days as an indoor sport, a tennis game’s score was kept by moving the hands of a clock to 15, 30 and 45. Later, for reasons now obscure, the 45 become 40 More Sports QuestionsMore Tennis Questions