This screen is the "TennisTrend" of the app, showing how the momentum in the match is swinging from one player to the other.

The red and blue lines show the resulting game scores, however achieved. Thus a game won by player A from 40-15 is scored as 4-1, and from deuce as 4-3.

The momentum is then accumulated from the difference in scores in each game. This is not quite the same as the accumulated difference in points, since a deuce game requires a points difference of 2, whereas the score difference is only 1. Nevertheless, the tennis trend is a good measure of how the game control is changing.

If you touch the "?", this shows a short version of the above information.