Doubles - A match between two teams of two players each.

Balance - The distribution of weight along the length of the racquet and usually referred to as head heavy, head light, or even. The measurement is calculated by the degree of weight distribution between the midpoint of the racquets length and the point where it balances. Generally speaking, a standard 27 inch frame will have an even balance point of 13.5 inches.

Groundstroke - A shot hit from the back court or behind the baseline after the ball has bounced; the standard shot in tennis.

Net Cord Judge - An official who is responsible for calling lets on service. This judge sits in front of the umpire's chair, at one end of the net, and rests one hand on top of the net in order to feel vibrations set up if the ball hits the net cord. Also called net judge..

Underspin - Underspin is imparted by the racket head tracking downward as it strikes the ball. It's backspin - spin counter to the direction of flight, as if the ball were "skidding" through the air. Since air molecules accumulate under the ball from both ahead and behind, air pressure builds up underneath the ball, creating lift. As a result, underspin shots plane (i.e., fly, like an airplane wing). So they easily go out long, if you don't hit them softly with low net clearance. Underspin on a drive (not a serve) is sometimes called "slice."

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

Match point - A point that will end the match if it is won by the leading player or side..

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