Novak Djokovic returns a shot to Germany’s Jan-Lennard Struff during their Tokyo 2020 Olympic Games men’s singles second-round match at the Ariake Tennis Park in Tokyo. Photograph: Giuseppe Cacace/AFP via Getty Images

After Novak Djokovic took his first small step towards a gold medal on Saturday, his defeated first-round opponent, the world number 140 Hugo Dellien (...)