Elena Rybakina of Kazakhstan celebrates after defeating Iga Swiatek of Poland during their fourth-round match at the Australian Open tennis championship in Melbourne, Australia, Jan 22, 2023. (MARK BAKER / AP)

MELBOURNE - World number one Iga Swiatek crashed out of the Australian Open on Sunday with a 6-4 6-4 defeat by Wimbledon champion Elena Rybakina on Rod Laver Arena.

Kazakhstan's Rybakina advanced to the quarterfinals of the season's opening Grand Slam for the first time with an impressive display against the misfiring Pole.

It was a really tough match and I really respect Iga because of the strike she has and the Grand Slams. She's a young player and she plays really well. Today I think was serving also good, just struggling on one side.

Elena Rybakina, tennis player

"It was a really tough match and I really respect Iga because of the strike she has and the Grand Slams," said Rybakina.

"She's a young player and she plays really well. Today I think was serving also good, just struggling on one side.

"Then in the important moments I played really well and it made a difference."

Rybakina, seeded 22nd, will face Latvia's Jelena Ostapenko in the quarterfinals.

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Swiatek, the reigning French Open and US Open champion, got off to a rough start, surrendering her opening service game after receiving a warning from the chair umpire over the time she took for her pre-match preparations.

Iga Swiatek of Poland plays a backhand return to Elena Rybakina of Kazakhstan during their fourth-round match at the Australian Open tennis championship in Melbourne, Australia, Jan 22, 2023. (MARK BAKER / AP)

She fought back to level the scores by the fourth game but Rybakina would break again, clinically punishing the Pole's second serve to take the opening set.

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Swiatek looked to have recovered after she rattled off three straight games at the start of the second set behind a more aggressive forehand, only for Rybakina to haul herself level with another break of serve.

The Russia-born right-hander broke Swiatek again at 4-4 in the second set before holding her own serve in convincing fashion to close out the match.

Rybakina's win sees her progress to a third Grand Slam quarterfinal having also reached the last eight at the 2021 French Open before winning Wimbledon last year.