How could Djokovic become a bigger earner than Federer?

If Novak Djokovic wins a third US Open, he will overtake 20-time Grand Slam champion Roger Federer as tennis' biggest on-court earner - ... thumbnail 1 summary
If Novak Djokovic wins a third US Open, he will overtake 20-time Grand Slam champion Roger Federer as tennis' biggest on-court earner - but how?

from BBC Sport - Sport https://ift.tt/2MbOhdW

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