In most professional play and some amateur competition, there is an officiating head judge or chair umpire (usually referred to as the umpire), who sits in a raised chair to one side of the court. The umpire has absolute authority to make factual determinations. The umpire may be assisted by line judges, who determine whether the ball has landed within the required part of the court and who also call foot faults. There also may be a net judge who determines whether the ball has touched the net during service. The umpire has the right to overrule a line judge or a net judge if the umpire is sure that a clear mistake has been made.
Premier events for women form the most prestigious level of events on the Women's Tennis Association Tour after the Grand Slam tournaments. These events offer the largest rewards in terms of points and prize money. Within the Premier category are Premier Mandatory, Premier 5, and Premier tournaments. The Premier events were introduced in 2009 replacing the previous Tier I and II tournament categories. Currently four tournaments are Premier Mandatory, five tournaments are Premier 5, and twelve tournaments are Premier. The first tiering system in women's tennis was introduced in 1988. At the time of its creation, only two tournaments, the Lipton International Players Championships in Florida and the German Open in Berlin, comprised the Tier I category.
The tiebreaker – more recently shortened to just "tiebreak", though both terms are still used interchangeably – was invented by James Van Alen and unveiled in 1965 as an experiment at the pro tournament he sponsored at Newport Casino, Rhode Island, after an earlier, unsuccessful attempt to speed up the game by the use of his so-called "Van Alen Streamlined Scoring System" ("VASSS"). For two years before the Open Era, in 1955 and 1956, the United States Pro Championship in Cleveland, Ohio, was played by VASSS rules. The scoring was the same as that in table tennis, with sets played to 21 points and players alternating five services, with no second service. The rules were created partially to limit the effectiveness of the powerful service of the reigning professional champion, Pancho Gonzales. Even with the new rules, however, Gonzales beat Pancho Segura in the finals of both tournaments. Even though the 1955 match went to 5 sets, with Gonzales barely holding on to win the last one 21–19, it is reported to have taken 47 minutes to complete. The fans attending the matches preferred the traditional rules, however, and in 1957 the tournament reverted to the old method of scoring.
Another benefit of post-tensioning is that contractors can build larger slabs using thinner concrete sections, and they don't have to install control joints which can interfere with play. "In order to build a reinforced concrete court that has the same structural capabilities as a post-tensioned court, we would have to install so much steel and concrete that the reinforced court would actually cost more," says Kolkmann. "Also, a reinforced court needs control joints, usually at a spacing of 10 to 15 feet, including in the playing area. Eventually these joints may widen, as well as any cracks that appear."
An advantage set is played until a player or team has won at least 6 games and that player or team has a 2-game lead over their opponent(s). The set continues, without tiebreak(er), until a player or team wins the set by 2 games. Advantage sets are no longer played under the rules of the United States Tennis Association, nor in the Australian Open starting from 2019; however, they are still used in the final sets in men's and women's singles in the French Open, Wimbledon, and Fed Cup. Mixed doubles at the Grand Slams (except for Wimbledon) are a best-of-three format with the final set being played as a "Super Tie Break" (sometimes referred to as a "best of two" format) except at Wimbledon, which still plays a best-of-three match with the final set played as an advantage set and the first two played as tie-break sets.
When shopping for a tennis racquet, decide whether you are looking for a pre-strung racquet or an unstrung racquet. Pre-strung tennis racquets are a good choice for most beginner and intermediate players, as they are highly versatile and allow you to focus on the fundamentals without added complexity. Advanced players often prefer an unstrung racquet, which allows them to tailor the string type and tension to their swing and playing style.
The players (or teams) start on opposite sides of the net. One player is designated the server, and the opposing player is the receiver. The choice to be server or receiver in the first game and the choice of ends is decided by a coin toss before the warm-up starts. Service alternates game by game between the two players (or teams). For each point, the server starts behind the baseline, between the center mark and the sideline. The receiver may start anywhere on their side of the net. When the receiver is ready, the server will serve, although the receiver must play to the pace of the server.
Further, the patenting of the first lawn mower in 1830, in Britain, is strongly believed to have been the catalyst, worldwide, for the preparation of modern-style grass courts, sporting ovals, playing fields, pitches, greens, etc. This in turn led to the codification of modern rules for many sports, including lawn tennis, most football codes, lawn bowls and others.