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Total prize money at this year’s U.S. Open will be a record $25.5 million with the men’s and women’s champions collecting $1.9 million apiece. But the real action is off the court, where elite tennis players jockey for multimillion dollar endorsement deals and lucrative exhibition fees. Younger rivals Rafael Nadal, Novak Djokovic and Andy Murray have challenged Roger Federer on the court in recen…