What is the tennis score when a server has won 4 points and the receiver has won 3 points?

In tennis scoring, the sequence of points goes from 0 (referred to as "love") to 15, 30, 40, and then either to game or deuce when both players reach 40. In this case, the server has won 4 points. The points scoring translates to 0, 15, 30, 40, and a potential advantage if they win the next point after reaching 40.

The receiver, on the other hand, has won 3 points, which corresponds to their score of 30. When the server has reached 40 and the receiver has reached 30, this leads to a score of 40-30. If the server wins the next point, they would win the game, but if they lose, the score would revert to deuce. Since the provided answer is ad-in, it aligns with the server having the advantage after reaching 40 while the receiver is still at 30. This terminology indicates that the server has the advantage, answering the question correctly as ad-in under these circumstances.