Break - To win a game as receiver; as a noun, a synonym for service break.

Triangular Widebody Cross-Section - Triangle-shaped cross-section to provide more power and frame stability.

Forced error - An error resulting from a good shot by the opponent..

Scoring system - The scoring system for modern tennis is based on that of its medieval ancestor, court tennis. In court tennis, a game comprised four rounds of 15 points each. That system was imposed on lawn tennis, as it used to be known, with the points numbered 15, 30, 45, and 60 (or game). Somewhere along the line, 45 was abbreviated to 40. The point is the basic building block; a game is made up of points, a set is made up of games, and a match is made up of sets.

Singles court - The court used for a singles match, which is 27 feet wide.

Closed racket - A racket held with a closed grip.

Chair - The umpire's seat and, by extension, the umpire, as in "The chair ruled that the shot was out." -

Changeover - A 90-second period after every odd-numbered game in a set, when players change sides.

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