Top-ranked tennis player Novak Djokovic remains on course for a Golden Slam after a 6-4, 6-3 win over Jan-Lennard Struff of Germany at the Tokyo Games.
Djokovic is attempting to become the first man to win all four Grand Slam titles and Olympic gold in the same calendar year.
The Serb already won the Australian and French Opens as well as Wimbledon this year. He now needs the Tokyo title and the U.S. Open trophy to complete the unique collection.
Steffi Graf was the only tennis player to achieve the Golden Slam in 1988.
Djokovic will next face 16th-seeded Alejandro Davidovich Fokina of Spain. Davidovich Fokina edged John Millman of Australia 6-4, 6-7 (4), 6-3.
