(Cameron Spencer/Getty Images)

World No. 1 Ash Barty has advanced to her her fourth straight Australian Open quarterfinal after defeating Amanda Anisimova 6-4, 6-3 on Sunday.

Anisimova did not go quietly, managing to end Barty’s streak of 63 consecutive service holds at the start of the second set. Barty also dropped serve for the first time in eight matches.

“It didn’t bother me too much. Honestly, I’m not counting how many games I hold in a row or not,” Barty said after the match. “The fact I was able to reset, break straight back was really important, just to be able to reset myself, go again and continue to do the right things.”

Barty overcame 17 unforced errors and three double faults with 23 winners.

With the win, Barty’s hopes to capture her first Australian Open (and third Grand Slam) title are still alive. She would become the first Australian to do so since Chris O’Neil in 1978.

In Tuesday’s quarterfinal, Barty will meet No. 21 Jessica Pegula, who took down No. 5 Maria Sakkari 7-6(0), 6-3 for her eighth career top-10 win. The 27-year-old Buffalo native will make her second straight appearance in the Australian Open quarterfinals.

No. 7 Iga Swiatek managed a comeback win over Sorana Cirstea 5-7, 6-3, 6-3 to reach her first quarterfinal in Melbourne and her first outside of the French Open, which she achieved last year.

“These kind of matches are going to give me a lot of confidence for the future, because coming back from losing in the first set and against a player who’s constantly going forward, it’s pretty hard, and I did that,” Swiatek said after the match. “I feel like I can approach these different scenarios on court, and at the end it’s pretty positive.”

Alizé Cornet will play in her first major quarterfinal in 63 Grand Slam appearances after defeating No. 14 Simona Halep 6-4, 3-6, 6-4 inside Rod Laver Arena on Sunday. Cornet will meet American Danielle Collins, who upset Elise Mertens 4-6, 6-4, 6-4.