Roger Federer Welcomes Twin Girls!

Roger Federer has two new tennis fans in his life.

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The tennis star and wife Mirka are the proud parents of twin girls, he announced on his website early Friday.

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The couple welcomed Charlene Riva and Myla Rose on Thursday night in Switzerland. "This is the greatest day of our lives," Federer, 27, said in a statement. "Mirka, Myla and Charlene are all healthy and doing very well."

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The No. 1 ranked player in the world -- he most recently won Wilbledon to become the 15-time Grand Slam champion -- met Mirka nine years ago but didn't get married until April. The couple announced the pregnancy in March.