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Dinner on Roger Federer ... 'cause the 20-time Grand Slam Champion was just declared a billionaire by Forbes!

The publication released the announcement on Friday, saying the 44-year-old retired superstar earned the title thanks to his minority stake in shoe and clothing company, On. Getty

Forbes estimates he now has a net worth of $1.1 billion.

His significant slice in On is just one piece of the puzzle. He also has plenty of high-profile sponsorships ... including Uniqlo -- which signed him for $300 million over ten years after he left Nike -- Rolex, Mercedes-Benz and more.

While he has found success off the court, the 44-year-old made himself a pretty penny on it, too -- he hauled in nearly $131 million, which is the third-best in tennis history.

The only

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