This is one of the funniest threads I have ever seen on TW. The OP posted a serious question but it led to some hilarious exchanges b/w rommil and Gorecki which still makes me LOL when I read it.
I saw this article on court speeds and how it is measured and immediately remembered this thread. Someone finally answered the OP's question though the OP seems to be banned now.
ORDER ON THE COURT 8:26 AM MAY 26, 2014
How Tennis Officials Are Trying to Make the Game Fair
By CARL BIALIK
Tennis pros, and dedicated amateurs, can control just about everything about their rackets. Rackets are measured for weight, stiffness, balance and head size and strung for peak force, deflection and tension loss. Yet the court players run and hit on will always behave unpredictably. Even at most pro tournaments, players don’t know precisely how “fast” or “slow” a given court is playing, an expression of how much speed and height the ball retains after it bounces. Court speed is a fixture of questions at press conferences during the first few days of Grand Slam tournaments such as the French Open, now unfolding in Paris.
“It wasn’t bouncing as much as it had actually the last days on the outside courts,” Milos Raonic after winning his match on Sunday.
One reason court speed is such a mystery is that it’s been so cumbersome to measure. The International Tennis Federation has helped develop and test machines that do the job, but the best ones are expensive, bulky and difficult to operate. (The equipment is so hard to transport that many court-surface manufacturers ship samples of their product, in half-meter (1.64-foot) squares of paint and sand, to the ITF’s testing laboratory in London.) For the most prominent ITF-organized events — the Davis Cup and Fed Cup — federation employees must fly with their testing devices, or ship them to sites weeks in advance, to keep hosts from giving players too big a home-court advantage.
Now, the ITF is trying to find an easier way to ensure courts are fair. On a recent Thursday at a London tennis court,1 Jamie Capel-Davies, manager of ITF’s science and technical department, was testing a new device that the federation has helped develop. It’s known as SPRite,2 and this test was of model number 007.
The device doesn’t take a vodka martini. Instead, a ball cannon powered by a bicycle pump propels a ball off the court and through the testing chamber. Seconds later, a display shows the court-speed measurement. The measurement device and ball cannon each weigh about 14 pounds and together cost $12,000, compared to the 110-pound, $45,000 behemoth that sets the standard now. The new devices can be carried by hand, and their dimensions fall within most airlines’ carry-on baggage limits. The motivation for the test, Capel-Davies said, was “democratizing court-pace rating.”3
The ITF knows it’s traded some precision for lightness and mobility. The question is, how much? Is SPRite accurate enough to replace its forebears? Capel-Davies and his colleagues were testing it alongside the Sestée, which is the current benchmark. Court-speed rating typically runs between 20 and 70 — and must run between 24 and 50 for Davis Cup matches (a higher number means a faster court).4 The ITF wants SPRite to run within two points of Sestée for the same court.
Court speed matters in tennis. During a typical match, the ball will bounce off the court hundreds of times. If the ball typically retains much of its speed, it will be harder to play. That encourages more aggressive play — players will charge the net more often to avoid skidding balls and tricky bounces. A slower court lets players camp out behind the baseline and chase down most shots.
Court-pace rating takes into account more than speed, though. The ITF tested the court speed perceptions of U.K. players who were good enough to play for their counties5 and found that the height of ball bounce mattered, too. The lower the bounce, the faster the court seemed. That’s why high-bouncing clay courts like the French Open’s seem slower than hard courts with the same coefficient of restitution, or ratio of the ball’s speed after impact to its speed before the bounce.6 And grass courts, with their lower bounce, seem faster to players than similar hard courts. The ITF formula attempts to account for all this.
Once a match is underway, players can’t do anything about the court speed. They play the bounces they get. But players can tailor their training and schedules around which courts best suit their games. For instance, clay makes Rafael Nadal’s heavily topspun forehand shots bounce even higher than on other surfaces. He has taken advantage of this throughout his career by playing more clay tournaments than some of his rivals.
For the ITF team competitions, court speed is a crucial part of home-court advantage: Host countries get to choose the surface, which is why Andy Murray had to play on his least favorite surface — clay — in Great Britain’s two away Davis Cup ties this year. (Murray and his teammates won in the U.S. but lost in Italy.)
With the currently approved devices, the ITF can’t test the courts at every Davis Cup site, especially on busy weekends when dozens of ties are happening around the world. Instead it audits, choosing to test just a few courts. And at tournaments it doesn’t oversee, including the French Open, there’s simply no official court-pace measurement. (Officials at the U.S. Open and Wimbledon said they test their courts for speed, but the results are confidential.)
That makes it tough to assess whether court speeds have changed — one of the goals of Capel-Davies’s department. Tennis players and writers often say — or lament — that pro tournaments are using a narrower range of court speeds than they used to, so there’s less variation among them. Indirect indicators, such as rates of aces or service breaks adjusted for tournament fields, don’t corroborate that impression. The ITF hasn’t tested long enough or often enough to settle the debate. “We don’t have that kind of data,” Capel-Davies said. “I don’t know if anyone does.”
The International Tennis Federation uses a bulky steel crate, top left, to ship heavy measuring devices to tournament sites. The outsized Sestée, top right, is difficult to transport, so manufacturers often send samples of their courts, bottom right, to the ITF. The latest-generation device is the SPRite, operated here by Jamie Capel-Davies, manager of ITF's science and technical department. Its accuracy is still being studied.
Carl BialikThe International Tennis Federation uses a bulky steel crate, top left, to ship heavy measuring devices to tournament sites. The outsized Sestée, top right, is difficult to transport, so manufacturers often send samples of their courts, bottom right, to the ITF. The latest-generation device is the SPRite, operated here by Jamie Capel-Davies, manager of ITF’s science and technical department. Its accuracy is still being studied.
Watching Capel-Davies test SPRite in London, it was easy to see the advantages of the new device. He easily carried it onto and around the court, to different testing spots. He also let me try, and within a few minutes I got each test down to under a minute: Take a ball out of a coat that’s lying next to the unit, put the coat back in place, put the ball into the cannon, give the bicycle pump a few cranks, prime the measurement unit, put my foot7 on it for stability and press the button to fire.
Yes, a coat. Needing something to stop the balls after they had fired from the cannon, bounced off the court and gone through the SPRite, Capel-Davies offered up his jacket to science, taking care to first remove his phone. After each test, the ball nestled in the coat. As we conducted our experiment, Capel-Davies’s colleagues were testing the Sestée on another part of the court. At one point, a Sestée-measured ball got loose and whistled past us.
More here : (too long to post completely)
http://fivethirtyeight.com/features/how-tennis-officials-are-trying-to-make-the-game-fair/
My boss woud give me a big raise by the end of this trimester (about 3 dollars in food coupons) 
