Strings (tennis)
The material used in tennis string can significantly affect a player's performance, and even health. Several materials are used to make tennis strings. They vary in terms of elasticity, durability, rebound efficiency, tension holding capability, and manufacturing cost, among other considerations.
Tennis scoring system
During informal play of tennis, especially at tennis clubs in the U.S. (also in other English speaking countries), score announcements are frequently shortened with the use of abbreviations. For example, a score 15 is replaced with "five", or in some cases "fif". "Love" is often substituted to indicate "zero". Similarly, the scores of 30 and 40 may sometimes be spoken as "three" or "four" respectively. A score of 15-all may sometimes be announced as "fives." To further confuse score announcements, a score of 30-all (30–30) may often be called "deuce", and the following point referred to as "ad in" or "ad out" (or "my ad" or "your ad"), depending on which player (or team) won the point. The logic for this is that a 30-all score is "effectively" the same as deuce (40–40).