Serum Institute of India CEO Adar Poonawalla on Thursday urged Serbian tennis superstar Novak Djokovic to get vaccinated against COVID-19. The 20-time Grand Slam winner has remained unvaccinated against coronavirus and has maintained that he is willing to miss out on future tennis trophies than be forced to take the jab. Posting a video of himself playing tennis, Poonawalla, whose Pune-based firm manufactures anti-COVID-19 vaccine Covishield, tweeted, "I respect your personal views on not getting vaccinated @DjokerNole and love watching you play, but I hope you change your mind. In the meantime, the rest of us now might stand a chance at a Grand Slam."