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Serena Williams and Andy Murray in 'Battle of the Sexes'?

The tennis champs say they'll play each other, but one of them doesn't feel so confident.

Andy Murray (Adrian Dennis/AFP/Getty Images); Serena Williams (Julian Finney/Getty Images)

Serena Williams has accepted a friendly challenge from reigning U.S. Open champion Andy Murray to a 'Battle of the Sexes' tennis match, EntertainmentWise reports. But Williams -- even with her five Wimbledon championships -- isn't sure she'll come close to winning the contest.

"It would be fun," Williams told ESPN. "I doubt I'd win a point but that would be fun. [...] maybe we can have a showdown though he's probably one of the top three people I definitely don't want to play."

She went on: "I suppose I could get some points off him but I think I'd have to do it on clay.

"He loves playing on grass and I do too but I'm going to definitely go clay. And the more I think about it I think I can get a game."

Read more at EntertainmentWise.