The origins of the 15, 30, and 40 scores are believed to be medieval French. It is believed that a clock face was used on court, with a quarter move of the hand to indicate a score of 15, 30, and 45. When the hand moved to 60, the game was over.
Why is it called LET and not net in tennis?
Let – a serve is called a let when the ball hits the net cord but still lands in the service court. Such a serve is not considered a fault and the server may repeat the service attempt. A ball that hits the net cord but lands outside the service box is still a fault.
What is the break in tennis?
Definition. In tennis language, when a server loses a game her opponent has “broken” her serve. So anytime you're one point away from winning a game while your opponent serves, you have a break point. A break point occurs when the game score is 0-40, 15-40, 30-40 or when the returner has the advantage in a deuce game.