Strings (tennis)
In tennis, the strings are the part of a tennis racquet which make contact with the ball. The strings form a woven network inside the head (or "hoop") of the racquet. Strings have been made with a variety of materials and possess varying properties that have been measured, such as dynamic stiffness, tension retention, thickness (gauge), string texture (shape of the string), and rebound efficiency.
2013 ITF Men's Circuit
The tournaments are played on a rectangular flat surface, commonly referred to as a tennis court. The dimenstion of a tennis court are defined and regulated by the ITF and the court is long, wide. Its width is for singles matches and for doubles matches. Tennis is played on a variety of surfaces and each surface has its own characteristics which affect the playing style of the game. There are four main types of courts depending on the materials used for the court surface, clay, hard, grass and carpet courts with the ITF classifying five different pace settings ranging from slow to fast.
Countries that are hosting a tournament in 2013, but did not in 2012.