"We've let our best kids play practice sets with the green ball, and every time we've done that the coaches say they're playing a better brand of tennis, " said Patrick McEnroe, the USTA's general manager of player development.
On the right, a floating green energy ball spins in a vertical tube.
Plenty of other parties will be celebrating a renewed commitment to the environment, including the Green Inaugural Ball, chaired by Al Gore and hosted by a number of organizations like the American Council on Renewable Energy, the Energy Action Coalition, and the Vote Solar Initiative.
The pitch looked green and the ball both swung and seamed around, particularly in the morning session.
Guan bounced the ball off the hill just before the green, which slowed his ball just enough to leave him with a short putt to save par.
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Ian Poulter said he used his umbrella to shield the wind so he could mark his ball on the green, but when the umbrella moved, so did his golf ball.
The Spaniard showed no nerves as he struck the ball past Green to cap a magnificent display.
The project also includes extra-care homes for the elderly on the former British Trimmings site at Ball Haye Green.
Dempsey then missed Fulham's best chance of the match when through on goal but he could only loft the ball into Green's arms.
Clint Dempsey offered an effort that was little more than pot luck from 25 yards, but Green hopelessly allowed the ball to squeeze through him and roll agonisingly over the line as he tried to recover.
The midfielder picked out Zubar out wide on the right and despite the Frenchman needing to shoot from a tight angle, he showed no hesitation in blasting the ball past Green for his first Premier League goal.
The hosts should have gone into the break 2-0 up but Nani wasted a glorious opportunity on the stroke of half-time, lifting the ball over Green but also over the bar from close range after a stunning clipped pass from Giggs.
But the laugh on the last was left to the Molinari brothers who held their nerve to secure a half point from the jaws of defeat as Francesco cleared the water feature protecting the green to land the ball within inches of the hole.
Green followed with a fly ball to left field, and Ruggiano scored easily from third.
Rolling the ball across the green, hopefully into the hole, is still what golf comes down to.
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Green refused to blame the ball for his handling error but admitted that it had moved unexpectedly after Dempsey hit his shot.
The playgrounds, ball fields and vast green space of Van Cortlandt Park lie along the area's eastern border.
On the Chinese fantasy course, one of the par-3s will give golfers the choice of hitting their ball onto a tiny green surrounded by lava rocks.
Arsenal remained comfortable in possession and Fabregas delivered a pin-point free-kick towards the charging Sol Campbell but the veteran defender could only parry the ball back to Rob Green with his shoulder.
But he didn't make another birdie the rest of the way, and took a double bogey on the par-3 17th when his shot plugged into the bank short of the green and he never found the ball.
Konchesky smacked the loose ball towards goal but Robert Green pounced on it to keep Fulham at bay.
"The ball was vacillating on the green, not moving but just kind of shaking, and the wind was blowing my putter head when I took it back, " he said.
"Although I hit the ball extremely well from tee to green, I missed a bunch of putts, " said the Ryder Cup star.
From 253 yards, he used a four iron to chase the ball down the length of the green and into the hole.
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Once you carry the bunkers the ball will not hold on the green as it falls away from the front to the back towards the rough and the road.
Garcia looked over to the crowd as his ball was headed well right of the green.
Dempsey's left-foot shot from 25 yards barely merited the label of speculative, but every aspect of Green's technique collapsed as he allowed the ball to squirm through his grasp and over the line.
Shortly after Green was beaten by a fierce Cole drive but the ball bounced off the top of the bar.
Research by the USGA has shown that U-shaped grooves allow top players to generate much more spin when playing the ball out of the rough, making the ball come to a quick stop on the green.
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