Kolkmann says that asphalt courts can also develop low areas over time due to settling of the soil or base under the asphalt surface. "With a post-tensioned slab, this area can be bridged and no settling will occur. In addition, concrete courts can often be installed on unstable soils where it would be cost-prohibitive to do extensive excavating and base work to support an asphalt court," he says.
Throughout most of lawn tennis' history, most rackets were made of laminated wood, with heads of around 65 square inches (420 cm2). A small number of them were made of metal, such as a 1920s racket by Dayton. Some, rarely, also had metal strings. In the late 1960s, Wilson popularized the T-2000 steel racket with wire wound around the frame to make string loops, after having purchased the design from René Lacoste, who produced the racket first in a more limited run. It was popularized by the top American player Jimmy Connors and was also, prior to Connors using it, by Billie Jean King in her early career. Many players said it lacked control but had more power, when compared with wood frames of the period. Connors used the rarer "firm" model that had additional throat welds to increase its stiffness. In 1968 Spalding launched an aluminum racket, called The Smasher. Aluminum, though lighter and more flexible than steel, was sometimes less accurate than wood. The biggest complaint, however, was that metal rackets caused strong cases of tennis elbow, especially the kind that had holes for the strings directly in the frame, rather than using an external wire wrapper, as in the T-2000. Because of that drawback in particular, most of the top players still preferred to use wooden frames.
The next item on your racquet checklist is string. Pre-strung tennis racquets are great for beginners and recreational players. More advanced players may opt to customize their string material, gauge, and tension to their personal playing style. Natural gut tennis strings are considered the best, which is why many advanced players use them, but they tend to require frequent changing. Synthetic strings are great for recreational players as they achieve a happy medium between durability and playability. In terms of gauge: Thicker strings last longer but thinner strings feel better to most players. Experienced players tend to prefer lower string tension in their tennis racquets because it yields more power, while greener players benefit from the increased control of high-tension stringing. Regardless of your preference, be sure to adhere to the racquet manufacturer’s tension guidelines. Plan to have your racquet restrung at least once per year, and a good rule to follow is: However many times you play per week is the number of times per year you should restring your racquet. So if you play twice per week, have your tennis racquet restrung twice per year. If you play seasonally, make sure to time your restringing so that it occurs just before the season starts.
Post-tensioned concrete is reinforced with a grid of high-strength sheathed steel tendons, or cables. While the concrete is curing, the cables are tensioned in both directions and held permanently under stress by anchoring them in a perimeter beam. This squeezing action keeps the concrete in compression, improving its tensile (or bending) strength. The more the concrete is squeezed together, the less likely it is that shrinkage cracks will develop or open. (See a more complete description of post-tensioning from the Post-Tensioning Institute.)
We’ve now covered scoring, the first step to learn as a tennis beginner — let’s move on to understanding the court. A tennis court is 78 feet long by 27 feet wide, and divided in half length-wise by the net. At each end of the court, there are white baselines — here, the serves are taken. These are also the out-of-bounds lines — a ball must not bounce beyond them or it’s out and the player who hit the ball loses a point.
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A tie-break set is played with the same rules as the advantage set, except that when the score is tied at 6–6, a tie-break game (or tiebreaker) is played. Typically, the tie-break game continues until one side has won seven points with a margin of two or more points. However, many tie-break games are played with different tiebreak point requirements, such as 8 or 10 points. Often, a 7-point tie-breaker is played when the set score is tied at 6–6 to determine who wins the set. If the tiebreak score gets to 6-6, then whichever player to win the best of two points wins the set. 
The purpose of the Northwest Louisiana CTA is to make an positive impact on the tennis community by providing support and resources in the development of programs, events, leagues, and facilities promoting tennis as a lifetime healthful sport within North Louisiana to all ages and all skill levels. The NWLACTA will collaborate with the USTA and other associations and programs in the pursuit of these goals.