I should say I'm relying again on info found here.
Association of Tennis Professionals. The ATP are the governing body of the men's professional tennis circuit. (The women have the WTA).
2. Baseline Tennis
Lleyton Hewitt is the perfect example, as he is a Baseliner. It simply means that players remain on the baseline (at the rear of the court) during a rally. This method of trying to win points can be tiring, but a good Baseliner will either wear down an opponent or set them up for passing shot.
3. Double Fault
If the server fails to serve correctly on both 1st and 2nd serves this is called a Double Fault. The server then loses this point.
4. Foot Fault
Where the server puts his foot onto or over the Baseline before hitting the ball. If performed on a 1st serve, you will only have your 2nd serve remaining. If performed on your 2nd serve you lose the point.
5. Golden Set
A set of tennis which is won 6-0 without dropping a single point. Only one player in the history of professional tennis has ever achieved this, Bill Scanlon (USA). It was against Marcos Hocevar (Brazil) in the first round of the WCT Gold Coast Classic at Del Ray (Florida, USA) on 22 February 1983. Bill Scanlon won the match 6-2, 6-0.
6. Grand Slam
To win all 4 of major tennis tournaments (Australian Open, French Open, Wimbledon and US Open) in one season you are said to have won the Grand Slam. Therefore, the 4 major tournaments are also known as Grand Slam events.
7. Let (or Net)
Called to announce that a point is to be replayed. A common example is when a serve clips the top of the net but still lands correctly in the court.
A term used in the Davis Cup, which essentially means a "heat" or a "leg". The Davis Cup consists of one Doubles Rubber and four Singles Rubbers. As an example, if you win the first Singles match, you have won a Rubber or a Singles Rubber.
9. Show Court (Showcourt)
A tennis court which is the one of the most prized of all to play on or to spectate on. For example, at Wimbledon the show courts are Centre Court, No.1 Court, and No.2 Court.
10. Tie break
This method is used to determine the winner of a Set once the score in Games is 6-6. See Rules Of Tennis (Brief) for full details. There is a Champions Tie Break variant that is sometimes used.