1. THE COURT.
The Baseline=The back line.
The Service-line=The back line of the service court, extending from side-line to side-line at a point 21 feet from the net.
The Alleys=The space on each side of the court between the side service-line and the outside sideline of a doubles court. They are used only when playing doubles and are not marked on a single court.
The Net=The barrier that stretches across the court in the exact centre. It is 3 feet high at the centre and 3 feet 6 inches high at the posts which stand 3 feet outside the sidelines.
2. STROKES (Two General Classes).
A. Ground strokes=All shots hit from the baselines off the bounce of the ball.
B. Volleys=Shots hit while the ball is in flight through the air, previous to its bound.
The Service=The method of putting the ball in play.
The Drive=A ground stroke hit with a flat racquet face and carrying top spin.
The Chop=An undercut ground stroke is the general definition of a chop. The slice and chop are so closely related that, except in stroke analysis, they may be called chop.
Stop Volley=Blocking a hall short in its flight.
Half Volley or Trap Shot=A pick up.
The Smash=Hitting on the full any overhead ball.
The Lob=Hitting the ball in a high parabola.
3. TWIST ON THE BALL.
Top Spin=The ball spins towards the ground and in the direction of its flight.
Chop, Cut, or Drag=The ball spins upwards from the ground and against the line of flight. This is slightly deviated in the slice, but all these terms are used to designate the under-struck, back-spinning ball.
Reverse Twist=A ball that carries a rotary spin that curves one way and bounces the opposite.
Break=A spin which causes the ball to bounce at an angle to its line of flight.
4. LET=A service that touches the net in its flight yet falls in court, or any illegal or irregular point that does not count.
5. FAULT=An illegal service.
6. OUT=Any shot hit outside legal boundaries of the court.
7. GOOD=Any shot that strikes in a legal manner prescribed by rules of the game.
8. FOOTFAULT=An illegal service delivery due to incorrect position of the server's feet.
9. SERVER=Player delivering service.
10. RECEIVER or STRIKER=Player returning service.
W. T. T. WIMBLEDON, July 1920