INDIAN WELLS, California — Defending champion Carlos Alcaraz and Italian rival Jannik Sinner remained on course for a semifinal showdown after cruising into the last eight of the BNP Paribas Open at Indian Wells on Tuesday.

Alcaraz sailed into the last eight as he took revenge on Hungary's Fabian Marozsan with a 6-3, 6-3 victory.

In-form Sinner, meanwhile, booked his last-eight berth with a 7-6 (4), 6-1 defeat of Ben Shelton.

Sinner's win was his 18th straight victory dating to late last season, leaving him three wins away from his third title of the season after winning the Australian Open and Rotterdam.

"I played really well in the tight moments," said the 22-year-old world No 3, who will face Czech Jiri Lehecka in the quarters.

"I knew I would not get much rhythm from him. I can be proud of how I played. The wind didn't make it easier but I tried to stay positive and it worked out."

Sinner could face Spain's reigning Wimbledon champion Alcaraz in the semifinals in California in what would be the latest installment of a burgeoning rivalry.

The duo fought an epic US Open quarterfinal in 2022 and met in the semifinals at Indian Wells and Miami Masters last season.

Alcaraz must navigate a quarterfinal against sixth seed Alexander Zverev before any meeting with Sinner.

Zverev reached the last eight after defeating Alex de Minaur 5-7, 6-2, 6-3 in two and three-quarter hours.

Alcaraz had a score to settle with the 58th-ranked Marozsan after losing their only other meeting at last year's Rome Masters.

Alcaraz never let his opponent into the fourth-round match, breaking twice in the opening set and winning 12 of the first 13 points of the second.

The top seed reeled off 22 winners in 75 minutes to race into the quarterfinals.

After a slow start this season and an ankle roll several weeks ago in Brazil, the 20-year-old appeared on course to continue his chase to a possible second title here.

'Almost perfect'

"I was nervous before the match, I'm not going to lie," Alcaraz said.

"I was playing someone who beat me when I had no chances in the Rome match."

But he walked off a winner completely pleased with his performance.

"Let's say (it was) almost perfect. I can play better," he added.

"But I'm really happy with the way I approached the match, the way that I played, and my feelings."

Elsewhere on Tuesday, Greek Stefanos Tsitsipas failed to reach a second career quarterfinal here, with the 11th seed losing 6-2, 6-4 to rising Czech youngster Lehecka.

The upset was the youngster's second in succession after dispatching fifth seed Andrey Rublev in the previous round.

Tsitsipas, whose form has been modest so far this season, achieved the last eight during his 2018 debut at the Tennis Garden but has yet to duplicate that effort.

In the women's fourth round, top seed Iga Swiatek beat Yulia Putintseva 6-1, 6-2 to set up a quarterfinal with Caroline Wozniacki.

Swiatek has beaten Putintseva in all three of their matches without the loss of a set.

She dominated the 79th-ranked Kazakh by sweeping the opening set in 29 minutes but was forced to battle in a second set featuring six breaks of serve.

"I had to keep focus in the second set," Swiatek said. "She was trying some different stuff.

"I just wanted to play my game and I'm glad I did."

Swiatek faces Wozniacki for a place in the semifinals. Wozniacki won a battle of returning tennis mothers, defeating Angelique Kerber 6-4, 6-2.

Both of the over-30 pair of former No 1 players and Grand Slam champions are back competing on the WTA Tour after giving birth.

"Things were going a bit my way and she was struggling a bit with her back," Wozniacki said. "I'm just happy I won.

"This will be my first quarterfinal since my three-and-a-half year (maternity) break.

"To be back playing is a special feeling."

Dubai champion Jasmine Paolini lost 7-5, 0-6, 6-3 to Anastasia Potapova while Ukrainian Marta Kostyuk beat Anastasia Pavlyuchenkova 6-4,6-1 to reach the last eight.

AFP