<p>Greece's Stefanos Tsitsipas advanced to the third round of the men's singles tennis at the Olympic Games while Japanese medal hopeful Naomi Osaka was eliminated from the women's event following a surprise defeat on Centre Court on Tuesday.</p>.<p>The roof of the main show court at Ariake Tennis Park was closed to allow the day's marquee matches to go ahead, although play was briefly suspended elsewhere during a morning downpour in Tokyo.</p>.<p>Men's world number four Tsitsipas avenged his straight-sets loss to Frances Tiafoe at Wimbledon last month, taking out the American 6-3 6-4 to book a place in the third round.</p>.<p>Tsitsipas attributed his win to improved "concentration and attention levels" at the Games. His Wimbledon first-round loss had come just days after he was beaten in a heartbreaking five-set defeat to top-ranked Novak Djokovic in the French Open final.</p>.<p>Argentina's Diego Schwartzman, who took the court after play resumed in the afternoon, also moved into the third round with a 6-4 7-5 win over Tomas Machac of the Czech Republic.</p>.<p>The women's draw was thrown wide open after four-time Grand Slam champion and world number two Osaka was downed 6-1 6-4 by Marketa Vondrousova in one of the biggest upsets of the Games.</p>.<p><strong>Read more: <a href="https://www.deccanherald.com/sports/approaching-typhoon-puts-olympic-organisers-in-disarray-1013285.html" target="_blank">Approaching typhoon puts Olympic organisers in disarray</a></strong></p>.<p>Osaka, who returned to competition this week after pulling out of the French Open in May citing mental health issues, never found her stride against the 42nd-ranked Czech, later attributing the loss to the pressure she faced as one of Japan's most prominent Olympic ambassadors.</p>.<p>Vondrousova, who had never played Osaka before, described the match as one of the biggest victories of her career.</p>.<p>"Of course it's one of the biggest. Naomi is a great player, she has so many Grand Slams, so I knew it would be a tough match. But I'm just very happy with my play," the 22-year-old said.</p>.<p>Osaka's loss came after top-ranked Ash Barty and world number three Aryna Sabalenka were sent out in earlier rounds.</p>.<p>"It's very open now," said Vondrousova, who next meets Spain's Paula Badosa. "I think every girl is playing really well. Now it's the quarterfinal, so we'll see." </p>
<p>Greece's Stefanos Tsitsipas advanced to the third round of the men's singles tennis at the Olympic Games while Japanese medal hopeful Naomi Osaka was eliminated from the women's event following a surprise defeat on Centre Court on Tuesday.</p>.<p>The roof of the main show court at Ariake Tennis Park was closed to allow the day's marquee matches to go ahead, although play was briefly suspended elsewhere during a morning downpour in Tokyo.</p>.<p>Men's world number four Tsitsipas avenged his straight-sets loss to Frances Tiafoe at Wimbledon last month, taking out the American 6-3 6-4 to book a place in the third round.</p>.<p>Tsitsipas attributed his win to improved "concentration and attention levels" at the Games. His Wimbledon first-round loss had come just days after he was beaten in a heartbreaking five-set defeat to top-ranked Novak Djokovic in the French Open final.</p>.<p>Argentina's Diego Schwartzman, who took the court after play resumed in the afternoon, also moved into the third round with a 6-4 7-5 win over Tomas Machac of the Czech Republic.</p>.<p>The women's draw was thrown wide open after four-time Grand Slam champion and world number two Osaka was downed 6-1 6-4 by Marketa Vondrousova in one of the biggest upsets of the Games.</p>.<p><strong>Read more: <a href="https://www.deccanherald.com/sports/approaching-typhoon-puts-olympic-organisers-in-disarray-1013285.html" target="_blank">Approaching typhoon puts Olympic organisers in disarray</a></strong></p>.<p>Osaka, who returned to competition this week after pulling out of the French Open in May citing mental health issues, never found her stride against the 42nd-ranked Czech, later attributing the loss to the pressure she faced as one of Japan's most prominent Olympic ambassadors.</p>.<p>Vondrousova, who had never played Osaka before, described the match as one of the biggest victories of her career.</p>.<p>"Of course it's one of the biggest. Naomi is a great player, she has so many Grand Slams, so I knew it would be a tough match. But I'm just very happy with my play," the 22-year-old said.</p>.<p>Osaka's loss came after top-ranked Ash Barty and world number three Aryna Sabalenka were sent out in earlier rounds.</p>.<p>"It's very open now," said Vondrousova, who next meets Spain's Paula Badosa. "I think every girl is playing really well. Now it's the quarterfinal, so we'll see." </p>