NEW YORK (AP) — The Latest on the U.S. Open tennis tournament (all times local):
Naomi Osaka swept her way into the fourth round of the U.S. Open for the first time, beating Aliaksandra Sasnovich 6-0, 6-0.
The No. 20 seed from Japan needed just 50 minutes, 25 per set, to eliminate the 33rd-ranked player from Belarus.
Osaka has reached at least the third round in six straight Grand Slam tournaments, the longest current streak on tour. She lost in that round in Flushing Meadows the last two years.
Roger Federer's 51 winners included one jaw-dropping flick around the net post and he got through a tough early spot to get past Nick Kyrgios 6-4, 6-1, 7-5 and reach the fourth round in a 17th consecutive U.S. Open appearance.
The outcome might very well have been decided with Federer serving at 3-all, love-40, less than 20 minutes in. He saved four break points in that game — and then never faced another.
In the 30th-seeded Kyrgios' previous match, the chair umpire climbed down from his seat to have a chat with the Australian's seeming lack of effort. There was no such visit during this match.
The No. 2-seeded Federer has won five of his record 20 Grand Slam titles at Flushing Meadows, but his most recent U.S. Open trophy arrived a decade ago.
He'll face 55th-ranked John Millman of Australia next. It's the first time Millman has reached the fourth round at any major tournament.
Wimbledon champion Angelique Kerber has been eliminated, leaving none of this year's Grand Slam winners left in the U.S. Open.
No. 29 seed Dominika Cibulkova rallied Saturday to beat the fourth-seeded Kerber 3-6, 6-3, 6-3, leaving only one of the top-four seeds on the women's side in the tournament after three rounds.
Top-ranked Simona Halep, the French Open champion, was eliminated in the first round. Australian Open champion Caroline Wozniacki, the No. 2 seed, fell in the second.
Only No. 3 seed and defending champion Sloane Stephens remains among the top-four seeds.
Madison Keys rallied after dropping the first set and the U.S. Open finalist from a year ago beat Aleksandra Krunic 4-6, 6-1, 6-2.
Keys lost to Sloane Stephens in the final last year and lost to her again this year in the French Open semis. But Keys has been plagued with injuries for most of the season and slipped out of the top 10 in the rankings.
The 14th-seeded Keys looked out of sorts in the first set but she was resilient the rest of the way and won 12 of the last 15 games. She said she was nervous — she even whiffed on an overhead — but thanked the crowd for pulling her through into the round of 16.
The youngest player left in the women's field is through to the fourth round.
Marketa Vondrousova upset No. 13 seed Kiki Bertens 7-6 (4), 2-6, 7-6 (1) in the first match completed Saturday at Louis Armstrong Stadium.
The 19-year-old Vondrousova was one of two teenagers to reach the third round, along with American Sofia Kenin. Kenin was knocked out Friday by No. 8 seed Karolina Pliskova.
Vondrousova was one of six Czechs, including Pliskova, to reach the third round. She could meet another, Katerina Siniakova, in the round of 16. Siniakova played Lesia Tsurenko later Saturday.
Roger Federer's matches against Nick Kyrgios have been as close as can be.
So the five-time U.S. Open champion could be tested in trying to reach the fourth round when he meets Kyrgios for the first time in a Grand Slam tournament.
The No. 2 seed has played the No. 30 seed three times on tour, all decided by a third-set tiebreaker. Federer won twice, including a victory this year in a Wimbledon tuneup.
Kyrgios' second-round win at the Open caused a stir. The chair umpire left his seat to talk with the Australian, who was putting forth little effort while dropping the first set and falling behind 3-0 in the second. Federer was among those critical of the umpire's conduct.
Federer is one of five seeded men in the top 10 playing Saturday. The others are No. 4 Alexander Zverev, No. 6 Novak Djokovic, No. 7 Marin Cilic and No. 10 David Goffin.
Wimbledon champion Angelique Kerber and 2018 runner-up Madison Keys are on the women's schedule, along with 2006 U.S. Open titlist Maria Sharapova facing 10th-seeded Jelena Ostapenko.
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