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It was one-way traffic as the Pole reeled off 10 consecutive games to secure her fifth win over Muchova, whom she also defeated at the same stage of the tournament last year.

"I felt I was playing better and better, just great," Swiatek said in her on-court interview.

"I love playing here, I love the conditions. I started to understand them a bit better a couple of years back and since then it feels like I can really use my advantages here.

"It's a great place to play tennis, hopefully I can keep doing that until the end."

Swiatek, who is seeking a third title at Indian Wells, will face either Katerina Siniakova or Elina Svitolina in the quarter-finals.

In the men's draw, 2021 champion Cameron Norrie beat Australia's Rinky Hijikata 6-4 6-2, with the 27th-seed Briton extending an impressive week after defeating six seed Alex de Minaur in the previous round.

Norrie will play either world number one Carlos Alcaraz or Norway's Casper Ruud in the last eight.