NEW YORK -- Playing conditions have been a talking point over the first few days of this year's US Open, with many players weighing in on the court speed and the state of the balls.

The problem is, players can't seem to agree.

"The court speed, I can't recall actually what was the year when it changed, when it started being slightly quicker than what it used to be," Novak Djokovic said at Flushing Meadows on Wednesday. "But it's been pretty much the same speed for some years."

The US Open is the only major to use different balls for the men's and women's events -- both use Wilson, but the men's "extra duty" ball is slightly heavier. Court speed and how fast or slow the balls are playing can be affected by temperature, wind and humidity, but whatever the weather, players always seem to

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