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"It was particularly swirly today. When I was warming up I was thinking that's going to be a big factor for the players out on Centre Court if they're going to leave the roof open or not," said Federer, who rallied from two sets down to reach the fourth round. "You just don't have the elements. You just don't have the sun setting, which can be tricky at times."
Kim Clijsters was one of the first players to play underneath the roof as she took part in an exhibition match together with Tim Henman, Steffi Graf and Andre Agassi in 2009 when it was unveiled. Clijsters was retired at the time, but has since returned to the sport and also advanced to the fourth round Friday, beating Vera Zvonareva on Court 1.
She's not quite sure when it should be used either, though.
"I actually don't know what the policy is," she said.
One thing that does seem certain: Players prefer it when the roof doesn't have to be used.
"This is an outdoor tournament, so I think everybody wants to play when the roof is open," Djokovic said.
Copyright 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.
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