Japan's world number three Naomi Osaka continued her grand slam winning streak to her 16th consecutive victory Monday at the U.S. Open, the fourth grand slam, and advance to the second round.
Second-seeded Daniel Medvedev easily booked his card for the same round, while third-seeded Stefanos Tsitsipas of Greece suffered a five-set defeat to Britain's Andy Murray.
Osaka is seeking her third title at Flushing Meadows in four years, beating Czech Mary Boskova 6-4, 6-1 in front of Arthur ash stagedum fans, to book a second-round appointment with qualifier Olga Danilovic of Serbia.
Osaka is happy.
"It's kind of crazy to play again in front of everyone," Osaka said of the fans' return to the field, adding, "I feel comfortable here. I'm glad I won."
It is the second time Osaka has beaten her opponent in their second encounter after she was also eliminated from the first round earlier this year at the Australian Open on her way to her fourth Grand Slam title.
The 23-year-old Japanese could become the first player to win the Flushing Meadows title two years in a row since Serena Williams, who announced her withdrawal from the country's championship due to a torn hamstring, won her third consecutive victory in 2014.
Osaka is fighting Flushing Meadows for a series of consecutive victories that began at the U.S. Open in Australia and then in the first round of the French Open before withdrawing due to mental problems.
"I felt lonely, so I'm happy to see young children among the crowd and adults as well," said the Japanese champion, who lit the boiler at the opening ceremony of her country's Olympics in Tokyo but was disappointed in the third round. The energy here is unmatched."
Osaka broke Boskova's serve in the 10th game of the first set when the Czech blocked the ball into the net, then repeated it in the second set to take a 2-0 lead on the way to victory in 93 minutes.
Second-seeded Arina Sabalenka of Belarus defeated Serbia's Nina Stojanovic 6-4, 6-7 (4-7), 6-0.
American 2017 winner Sloane Stevens also beat fellow American Madison Keys 3-6, 6-1, 7-6 (9-7), and hit a date with another American, teenager Coco Goff, who beat Poland's Magda Linetti 5-7, 6-3, 6-4.
Daniel Collins of the United States defeated Carla Soares Navarro of Spain 6-2, 6-4, and Russian Ekaterina Aleksandrova defeated Italian Sara Erani 6-3, 6-2.
Egypt's Mayar Sharif claimed the championship in the first round by losing to Ukraine's Anhelina Kalinina 4-6, 6-1, 6-1.
Anas Jaber Crossing
Tunisia's Anas Jaber booked her place in the second round by beating France's Alize Cornet by two sets for nothing.
The Tunisian star, who reached the third round in last year's edition, managed to win the first set by seven runs to five, before snatching the second set as well as the same result to qualify for the second round.
Also in the second round, the runner-up of the past Belarusian version, Victoria Azarenka, qualified after an easy victory over Czech Teresa Martinkova in two unanswered sets with six runs for four in the first set and six runs for zero in the second.
A difficult crossing for Tsitsipas and angry Mwari
In the men's tournament, Greece's Tsitsipas needed five sets, four hours, and 49 minutes to beat Murray, who was crowned three grand slam winners, 2-6, 7-6 (9-7), 3-6, 6-3, 6-4.
"If we get an electrified atmosphere here, it's something we've been waiting for," Tsitsipas said, praising the crowd and the charming atmosphere.
It was the first loss for two-time Olympic champion Murray, ranked 112th in the world, in his 15 first-round appearances at Flushing Meadows.
Tsitsipas, this year's Roland Garros champion, asked for a long break before the last set for seven minutes, which upset Murray, who managed to break his opponent's serve at the start of the match, and what the Greek did was at the heart of the Briton's talk after the end of the match.
"I don't have time for these things and he lost my respect for him," Murray said. This is nonsense, and he realizes that."
Tsitsipas, who will face Frenchman Adrian Mannarino in the next round, defended himself, saying he had complied with the ATP's rules in terms of rest and medical break times, although his rival questioned the duration and timing.
"I played by the rules and adhered to what the ATP says is fair," he said.
"Then the rest is fine," he said.
Murray fell in the break of the second set because of his wet sneakers, and wasted two points to settle for him, the 23-year-old Greek responding by winning five of the next six points and scoring the set.
Murray responded by breaking his opponent's serve in the second half of the third set to settle for him before Tsitsipas won the next two sets and the match.
Second-seeded Daniel Medvedev defeated Frenchman Richard Gasquet 6-4, 6-3, 6-1.
It was the 200th victory in the Russian's career and the 160th on hard courts.
Canadian Felix Oge-Aliassim crossed the hurdle with great difficulty and beat him 7-6 (7-0), 3-6, 7-6 (1/7), 7-6 (8/10).