Pros have always varied their string tension a little based on the court surface, weather conditions and their opponent's style of play.
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The American second seed was still on court well past midnight and, on her least favorite clay-court surface, was sent packing 6-2 2-6 6-1 by Swiss Patty Schnyder.
But the eyes of the tennis world were on Nadal as he returned to the more unforgiving hard court surface for the first time in 346 days with a second round match against Ryan Harrison of the United States Saturday.
An example court pace rating for each surface may be 23 for a clay court, 35 for a hard court and 46 for a grass court.
Murray, who has never won a clay-court title despite training on the surface as a young teen in Spain, reached the quarterfinals at Roland Garros last year.
It helps that the tennis season plays into his hands now as the tour moves on to the hard-court season, which is his best surface.
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He decided the skip the hard-court event and go straight to his favored clay surface, on which he will also play in a Brazilian tournament after Chile.
However after playing 18 matches in six weeks, the new world No. 4 has pulled out of next weekend's Miami Masters, though he plans to return for April's Monte Carlo Masters, where he will bid for a ninth successive triumph at the clay court event -- the Mallorcan's favorite surface.
The maths of the clay surface are distinctly different to grass or hard-court surfaces.
Marshall attended the appeals court arguments in a wheelchair in December and had health issues surface at his trial: a mini-stroke and a fall in a courthouse restroom.
Head of women's tennis at Britain's Lawn Tennis Association (LTA), Nigel Sears, told CNN the slippery nature of the clay surface also set it apart from other types of court.
There's still some hard-court season left, and Nadal has been grousing about it, feeling the surface agitates his worn knees.
Mr. Gaffney warned against the significant erosion in U.S. sovereignty that would attend U.S. endorsement of the International Seabed Authority (ISA) - a supranational organization with unprecedented powers to regulate seven-tenths of the earth's surface, levy taxes, govern ocean research and exploration, and create a multinational court to render and enforce its judgments.
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