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Roger Federer Says Another Child On The Way In 2014

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Switzerland's Roger Federer smiles as he celebrates beating Argentina's Juan Martin Del Potro during their group B singles match in the round robin stage on the sixth day of the ATP World Tour Finals tennis tournament in London on November 9, 2013. Federer won 4-6, 7-6, 7-5. AFP PHOTO / GLYN KIRK (Photo credit should read GLYN KIRK/AFP/Getty Images) | GLYN KIRK via Getty Images

Already in the swing of parenting, Roger Federer is getting ready for a larger family.

The tennis star says on Twitter that he and his wife, Mirka, are expecting another child next year.

Twins Charlene and Myla were born in July 2009, and Federer wrote Wednesday, "Mirka and I are very happy to share the news" that the couple's daughters "will be big sisters in 2014!"

Federer's agent, Tony Godsick, confirmed to The Associated Press the tweet is legitimate.

The 32-year-old Federer has won a record 17 Grand Slam singles titles and spent more weeks at No. 1 than anyone else in the history of the ATP rankings.