How to decide the outcome of a tennis match?

Simply put, if you win a game. A game is based on 4 points, and the net winning point is based on 2 points. One side scored 4 points first and won the other side by more than 2 points, even if that side won the game. For example, 4: 0; 4: 1; 4:2。 If it reaches 4: 3, it will take 5: 3 to win the game. etc