Federer watched Woods play at the HSBC Champions tournament and afterwards they went out to dinner.

The world's top tennis player and golfer respectively, who first met at this summer's US Open, regularly keep in touch by phone, Federer said.

"We had a good time. He's a really relaxed and laid-back guy," he said.

"I spoke to him yesterday. He's in Japan now. I don't know how his round went, but I hope he's doing well."