PIX: Muchova stuns former champion Osaka; Swiatek cruises

Images from the US Open women's singles second round matches, at Flushing Meadows, New York, on Thursday.

Czech Karolina Muchova delivered a flawless display of serve-and-volley tennis to knock twice champion Naomi Osaka out of the US Open with a 6-3, 7-6(5) second round victory on Thursday.

Muchova enjoyed the best season of her career last year before a wrist injury sidelined her for 10 months, but she looked back to her best at Arthur Ashe Stadium as she set up a third round meeting with unseeded Russian Anastasia Potapova.

Four-times major winner Osaka of Japan, who missed last year's tournament while on a maternity break, was brilliant in her opening round win over 10th seed Jelena Ostapenko but a handful of costly mistakes sunk her chances against Muchova.

"Honestly, this year the biggest win for me is that I could play again," said Muchova, who returned to the tour in June. "I'm really grateful that I'm able to play tennis."

The two big servers were deadlocked early in the match before Muchova converted a break point when she forced Osaka into a backhand error in the seventh game, and the former world number one dropped serve again in the ninth.

Muchova looked in cruise control with an easy hold in the opening game of the second set but Osaka battled hard to keep the match tight, fending off three break points in the next game.

Osaka broke Muchova with a powerful forehand into the corner in the ninth game of the second set and had the momentum as she went up 40-0 in the 10th, bringing the crowd to its feet at the same venue where she beat Serena Williams to win her first Grand Slam six years ago.

However, she let the match slip through her fingers as her forehand began to malfunction, the former world number one throwing her racquet in disgust as she sent one long on the second break point.

Muchova has not had much match experience in 2024 after undergoing wrist surgery in February but looked razor sharp in the tiebreak, firing down a pair of unreturnable serves before Osaka sent one long on the second match point.

Swiatek too good for Japanese qualifier Shibahara

Iga Swiatek made quick work of Japanese qualifier Ena Shibahara in a 6-0, 6-1 victory in the second round to underline her title credentials at the US Open.

Swiatek survived a slight scare in the first round when she committed a slew of unforced errors before sealing a hard-fought victory over Russian Kamilla Rakhimova, but against Shibahara, she was clinical and swatted her Japanese opponent aside in just over an hour.

"I'm playing, you know, not overpowering (tennis), but trying to be really solid and picking the right shots and being proactive. I'm happy with everything," Swiatek said in her on-court interview.

"I just felt the rhythm much better. I was a bit tense in my last match, so today I just wanted to focus on the right things and focus on myself."

The Pole served with real accuracy in the first set, winning 89% of points on her first serve and converting three out of four break-point opportunities to race into the lead against a frustrated Shibahara, who had no answers.

Japan's Shibahara, ranked outside the top 200 and in her first singles Grand Slam main draw, tried to turn things around in the second set and defended three break-points in a marathon service game to hold for 1-1 and avoid the dreaded 'double bagel'.

That was the extent of her resistance, however, as Swiatek won the next five games in a row to clinch victory.

Swiatek, who won the third of her five Grand Slams at Flushing Meadows, is next in action in a third-round tie against either Russian Anastasia Pavlyuchenkova or Elisabetta Cocciaretto of Italy.(