Winning his 15th Grand Slam title at Wimbledon this year wasn't the best day of Roger Federer's life. Instead, it was Thursday—when the tennis pro's wife, Mirka, gave birth to twin girls, Myla Rose and Charlene Riva, late in Switzerland. Federer said that the girls "are both healthy, and along with their mother they are doing great." He continued, "This is the best day of our lives."
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