There are some rules in Tennis game. You can learn those Rules by following below link, there is a understandable and simple article about tennis rules that you can learn easily thank you.
http://tennisworld-tennis.blogspot.com/
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Generally, the rules of tennis at Wimbledon are the same as in other Grand Slams or tournaments (games go 15, 30, 40, then game; 6 games in a set). The only noticeable differences are that in the fifth set, there is no tiebreaker (which resulted in the longest match in the history of tennis between Nicolas Mahut and John Isner) and that to win, the player must win 3 out of 5 sets.