Roger Federer has two new tennis fans in his life.

See more summer baby bumps

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

Take a look at the celebrity babies born last year

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."

Check out Us Weekly's baby bump hall of fame

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.