Third-seeded Stefanos Tsitsipas of Greece made his Olympics debut with a hard-fought 6-3, 3-6, 6-3 win over Philipp Kohlschreiber of Germany on Sunday in the first round of play in the 2020 Tokyo Games.
Tsitsipas rallied from a break down in the third set to set up a second-round showdown with American Frances Tiafoe, who advanced with a 6-3, 6-2 win over South Korea’s Sunwoo Kwon.
Tiafoe ousted Tsitsipas in the first round at Wimbledon in late June.
Germany’s Alexander Zverev, the No. 4 seed, had nine aces in a 61-minute, 6-1, 6-3 romp over Yen-Hsun Lu of Chinese Taipei.