Djokovic announced his participation on the Olympic Games VIDEO
Djokovic did it in a video birthday message for a six-year-old tennis player from Japan, Kojiro.
"Happy birthday, Kojiro, my friend. Happy 6th birthday. You look great, I follow your tennis and your progress. All the best, I hope to see you at the Olympic Games in Tokyo," Djokovic sent a congratulations message as a surprise gift.
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