Why there is strange point system in Tennis (like 15,30,45,Deuce and Break point) ? ?

Question

Why not 1 2 3 game ???

Answer 1

this question has been asked so. many. times. Its the clock thingy

Answer 2

Because they used to use a clock as a scoreboard.  The 15, 30, 45 scores relate to the positions on a clock face. Deuce was straight up midnight.  

Answer 3

the system may be based on the presence of a clock face at the end of the tennis court. A quarter move of the appropriate hand was made after each rest, with the score being called as 15, 30, or 45. As the hand was moved to 60, this was the game. This didn't explain a score of 40, however, so we continued on.

and

Tennis scoring has its origin in medieval numerology. The number 60 was considered to be a "good" or "complete" number back then, in about the same way you'd consider 100 to be a nice round figure today. The medieval version of tennis, therefore, was based on 60 -- the four points when 15, 30, 45 (which we abbreviate to 40) and 60, or game.

Answer 4

this goes back to the early days of tennis when it was played on horseback.  thank you.