Flat serve
 A flat service is hit without spin and follows a
 low, straight trajectory. Given the high risk of
 hitting the net, it is generally better-suited for
 first serves.

 Follow-through
 Where a player swings the racquet through in
 the direction of the stroke, even after the ball
 has been played. The follow-through affects the
 length, direction and speed of the ball.

 Foot fault
 An error occurring when a player steps onto or
 over the baseline, sideline or the center mark
 when serving. Foot faults also occur if the
 player fails to serve from a static position.

 Footwork
 A player's technique for moving most
 economically to the ideal position to play a
 stroke. Techniques include tango, side-step
 and cross-step.

 Forecourt
 The front part of the tennis court, the ideal
 position for controlling a point, is between the
 net and the service line.

 Forehand
 A ground stroke played by left-handers to the
 left of the body, and by right-handers to the
 right.