(Bloomberg) -- Tennis superstar Roger Federer is now one of the few athletes who can count themselves a billionaire. Most Read from BloombergPhiladelphia Transit System Votes to Cut Service by 45%, Hike FaresUS Renters Face Storm of Rising CostsSqueezed by Crowds, the Roads of Central Park Are Being ReimaginedMapping the Architectural History of New York’s ChinatownUS State Budget Wounds Intensify From Trump, DOGE Policy ShiftsFederer, who won 20 Grand Slams between 2003 and 2018, amassed $130.6