Tennis

2. The player who puts the ball into play at the start of the game
4. The point after a deuce
6. A ball that is hit so that it travels in a high arc
8. No score
9. A series of sets determined by the best out of three or five
13. A single point that a player must get in order for him to win the the match
16. Hitting the ball with the racket
18. A ball hit so that it spins forward in the direction that it is hit
19. A service failure where the ball does not land in the upper service court or is not served in the proper manner
20. A series of games when a player has won at least 6 games and is two games ahead of his opponent
21. A served ball that hits the net but lands in the correct service court, as any point that is replayed

1. The court in which the service must land if it is to be considered good
3. Type of play in which a player gets to the net as soon as possible
5. Striking a ball before it has bounced
7. A single point that a player must get in order to win the set
10. Opposite of a topspin the ball doesn't take a normal bounce because of its backward spin
11. The line at each end of the court
12. A good service the reliever is unable to touch with racket
14. One or both feet touches the court on the inside of the baseline before the ball is hit
15. The score 40-40
16. Hard overhead stroke that sends the ball downward over the net
17. A lengthy exchange of strokes