Novak Djokovic Lionel MessiGOAL/Getty

Lionel Messi recognises the tennis GOAT! Argentina superstar exchanges shirts with Novak Djokovic after watching Serbian reach Miami Open final with quick victory over Grigor Dimitrov

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  • Messi attended Miami Open semi-finals
  • Djokovic beat Dimitrov to reach final
  • Argentine working way back from injury