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In Tennis, Tough Decisions as Players Adjust to Shrunken Paydays - The New York Times
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ATP: career prize money earnings of tennis players 2019 | Statista
Novak Djokovic Overtakes Roger Federer in Career Earnings From Prize Money
Roger Federer becomes first tennis player to top Forbes' rich list
ATP: career prize money earnings of tennis players 2019 | Statista
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Highest earning tennis players of all time | top 10 earners | Radio Times
Osaka surpasses Serena on Forbes' list of sports annual earnings | Daily Sabah
Accounting for Tennis Prize Money - The Changeover
US Open Prize Money: How Much Winners Make Will Blow Your Mind – Footwear News
