A video recently surfaced on Twitter of tennis superstar Novak Djokovic receiving his first tennis racquet when he was just four years old.The Tennis Letter@TheTennisLetterFour-year-old Novak Djokovic receives his very first tennis racquet for his birthday. @DjokerNole[📸 by @telegrafrs]2244355Four-year-old Novak Djokovic receives his very first tennis racquet for his birthday. @DjokerNole[📸 by @telegrafrs] https://t.co/WB9LBVSRewIn June 1991, a four-year-old Novak Djokovic can be seen throwing a mini tantrum when asked to sing using the karaoke machine in the corner. However, his face lit up when he received a gift in the form of a tennis racquet.The joyful Serb picked up the mic of the karaoke machine and started singing while holding the tennis racquet in his right hand. As soon as he was done singing, Djokovic rushed outdoors to try out his new racquet.Novak Djokovic's stop-start 2022 seasonDjokovic in action in Dubai Duty Free Tennis ChampionshipNovak Djokovic's season was initially fraught with uncertainty due to his vaccination status but he is seemingly back in the flow of things. The Serb reached the final of his home tournament in Belgrade, where he lost to Andrey Rublev in three sets.The 34-year-old was unable to compete in competitions in Australia and the United States due to his vaccine status and has only played in three tournaments this year, losing to Jiri Vesely in the quarterfinals of Dubai, Alejandro Davidovich Fokina in the second round of the Monte-Carlo Masters and Rublev in the Belgrade final.ATP Tour@atptourOH MY @DjokerNole @SerbiaOpen2022 | #SerbiaOpen85996OH MY 👀 @DjokerNole @SerbiaOpen2022 | #SerbiaOpen https://t.co/nbzbFVHmkhThe Serb, however, gained plenty of time on the court in Serbia, where he was pushed to the limit in each of his four matches.Djokovic is next slated to take part in the Mutua Madrid Open, which begins on May 1. He has won the tournament three times in his career so far. While he is not on the list of favorites for the upcoming edition, it is never wise to write off the World No. 1.