Defending champion Carlos Alcaraz sailed into the quarter-finals of the ATP-WTA Indian Wells Masters on Tuesday as he beat Fabian Marozsan with a 6-3, 6-3 victory.

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 quarter-finals.

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.

Greek Stefanos Tsitsipas failed to reach a second career quarter-final here, with the 11th seed losing 6-2, 6-4 to rising Czech youngster Jiri Lehecka.

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

Tsitsipas was ousted in 78 minutes by number 32 Lehecka, winner of the January Adelaide title and now heading into the first Masters quarter-final of his career.

The Czech who has been working since late last season with a mental coach, will await the winner of Australian Open champion Jannik Sinner's clash with Ben Shelton.

Lehecka, 22, dominated from the start, claiming the opening set with two breaks of Tsitsipas and losing just four points on serve.

In the second, the Czech saved four break points and advanced on his first match point.

In the women's fourth round, 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)