In some tournaments, line judges who would be calling the serve, were assisted by electronic sensors that beeped to indicate the serve was out. This system was called "Cyclops".[60] Cyclops has since largely been replaced by the Hawk-Eye system.[61][62] In professional tournaments using this system, players are allowed three unsuccessful appeals per set, plus one additional appeal in the tie-break to challenge close line calls by means of an electronic review. The US Open, Miami Masters, US Open Series, and World Team Tennis started using this challenge system in 2006 and the Australian Open and Wimbledon introduced the system in 2007.[63] In clay-court matches, such as at the French Open, a call may be questioned by reference to the mark left by the ball's impact on the court surface.
From a poor defensive position on the baseline, the lob can be used as either an offensive or defensive weapon, hitting the ball high and deep into the opponent's court to either enable the lobber to get into better defensive position or to win the point outright by hitting it over the opponent's head. If the lob is not hit deeply enough into the other court, however, an opponent near the net may then hit an overhead smash, a hard, serve-like shot, to try to end the point.
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.
Kirill Azovtsev, when I first met him four years ago, was 21, just a few years older than my oldest son. He was an assistant professional at the New York Athletic Club’s tennis facility in Pelham, N.Y., where I live. He had begun playing competitive tennis at 14 in St. Petersburg, Russia, where he was born, and arrived here a few years later with a tennis scholarship to attend Concordia College in Bronxville, where he was part of a team that reached the top 10 in Division II. Even before he graduated, in 2008, he had received the training to become a tennis instructor.
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What gives concrete the competitive edge? According to Fred Kolkmann, tennis and track division manager for Munson Inc., Glendale, Wis., concrete play courts are more durable, low maintenance, and crack resistant. Munson specializes in post-tensioned concrete and other types of play courts, and has won national and state awards for its concrete tennis court installations.
Tennis is played by millions of recreational players and is also a popular worldwide spectator sport. The four Grand Slam tournaments (also referred to as the Majors) are especially popular: the Australian Open played on hard courts, the French Open played on red clay courts, Wimbledon played on grass courts, and the US Open also played on hard courts.