This is the one record Roger Federer has set that future tennis players will struggle to beat

Gareth Fuller/AP

• Tennis champion Roger Federer is widely considered to be the greatest men's single player of all time.
• Federer has won 20 Grand Slam tournaments, is an Olympic gold medalist, and has set many records in a widely successful 20-year career.
• A Quora user asked which of Federer's many records will be the most difficult to beat for future tennis champions, and triggered a number of responses.
• Here is the most popular answer.

Tennis champion Roger Federer has set many records in his sport — but which has the best chance of standing the test of time?See the rest of the story at Business Insider

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