rubber with a felt coating. Traditionally white, the predominant colour was gradually changed to optic yellow in the latter part of the 20th century to allow for improved visibility. Tennis balls must conform to certain criteria for size, weight, deformation, and bounce to be approved for regulation play. The International Tennis Federation( ITF) defines the official diameter as 65.41 – 68.58 mm( 2.575 – 2.700 in). Balls must weigh between 56.0 and 59.4 g( 1.98 and 2.10 oz). Tennis balls were traditionally manufactured in the United States and Europe. Although the process of producing the balls has remained virtually unchanged for the past 100 years, the majority of manufacturing now takes place in the Far East. The relocation is due to cheaper labour costs and materials in the region.
VII. 5 Tennis- miscellaneous
Advanced players improve their performance through a number of accoutrements. Vibration dampeners may be interlaced in the proximal part of the string array for improved feel. Racket handles may be customized with absorbent or rubber-like materials to improve the players ' grip. Players often use sweat bands on their wrists to keep their hands dry and head bands or bandanas to keep the sweat out of their eyes as well. Finally, although the game can be played in a variety of shoes, specialized tennis shoes have wide, flat soles for stability and a built-up front structure to avoid excess wear.
https:// en. wikipedia. org / wiki / Tennis
VII. 6 Tennis – leading sportsmen
SIMONA HALEP-( born 27 September 1991 in Constanța) is a Romanian professional tennis player who is currently ranked world No. 1 in singles by the Women ' s Tennis Association( WTA). Halep first broke into the world ' s top 50 at the end of 2012, reached the top 20 in August 2013, and finally the top 10 in January 2014. She won her first 6 WTA titles in the same calendar year in 2013( a feat that was last achieved by Steffi Graf in 1986 when she won her first 7), being named the WTA ' s Most Improved Player at its end, as well as being named ESPN Center Court ' s 2013 Most Improved Player.
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