Tennis-Federer and Roddick call for review of timeout rule

"It's a tough call. I guess we'll speak about it and see what happens."

Federer also had mixed feelings about Djokovic's complaint that he was hard done because he played his fourth-round match late on Sunday night then his quarter-final on Tuesday afternoon.

Djokovic had asked to play his quarter-final during Tuesday's evening session when the weather was cooler but organisers put Federer on instead.

"At the beginning of the tournament you have a hundred players requesting something. You can't always give the players everything they want," Federer said.

"I was the lucky guy who played tonight but I would have been ready to play in the heat as well. I like playing in the heat.

"Novak had a day off. It's not like he had to play the next day at 11:00 in the morning. He still had a day and a half off.

"I don't think it's the end of the world."

Roddick agreed with Djokovic that switching from night matches to day was hard and suggested organisers should consider changing their night programmes.

There are normally two matches played on the Australian Open centre court each night, a women's match followed by a men's, but if the women's match goes three sets, the men often have to play well past midnight.