Carlos Alcaraz’s path to the round of 16 at the Madrid Open was comparatively smoother as the emerging tennis star secured a straight-set triumph against Grigor Dimitrov Sunday.

After struggling in a three-set win in his opener against unseeded Emil Ruusuvuori, Alcaraz improved to get past the 26th-seeded Dimitrov 6-2, 7-5 and stay on track to defend his title on home soil.

Alcaraz was still not at his best but sealed the victory by converting four of his six break opportunities against Dimitrov. The second-ranked Spaniard was broken only once in the second set. He finished with 16 winners and four unforced errors.

"We didn’t do some things well in that first match, and it was clear that we had to get back to doing what we know, which is to go on the attack," Alcaraz said.

It was the 17th straight win for the 19-year-old Alcaraz on home soil. He won the Barcelona Open for a second consecutive year earlier this month.

He next faces 13th-seeded Alexander Zverev in a rematch of last year’s final in the Spanish capital.

"I have great memories from last year in the final, but obviously, I have to be really focused in that match," Alcaraz said. "I know that Sascha is an outstanding player, an aggressive one with good serves. I have to show all my skills."

Iga Swiatek continued to cruise in the women’s draw, reaching the round of 16 with a comfortable 6-3, 6-2 win over Bernarda Pera.

The world No. 1 conceded only one break point and converted four of the 13 she earned against the 32nd-ranked American.

Swiatek had beaten Julia Grabher by the same score in her opening match in Madrid. The Polish player has won six straight games in her clay-court season while dropping only one set.

"I wouldn’t say it was easy," Swiatek said. "Every match is tricky here. But I’m happy that I’m getting my rhythm. Playing against a lefty is never easy ... but I’m pretty happy I was disciplined and focused."

Swiatek has lost only five games in her first two matches this week, dropping serve only once in each round.

This is her second appearance in Madrid, having missed the tournament last season because of a right shoulder ailment. She lost to then-No. 1 Ashleigh Barty in the previous 16 in 2021.

Swiatek will next play 16th-seeded Ekaterina Alexandrova, who came from behind to defeat 22nd-seeded Zheng Qinwen 5-7, 6-4, 6-2.

Third-seeded Jessica Pegula had to work harder on her way to a 6-4, 7-6 (2) win over Marie Bouzkova. The American saved 12 of the 14 break opportunities she conceded against her 31st-ranked opponent.

"It was definitely a long, physical game," Pegula said. "It’s always hard to play Marie. We always have tough, long matches. I knew it was going to be very difficult."

Two-time Madrid Open champion Zverev cruised past qualifier Hugo Grenier 6-1, 6-0 in less than an hour.

"Today, I felt great," Zverev said. "Maybe Hugo was a bit nervous, the first time in the third round at a Masters, which is big for any player. But, in general, I am happy that I kept my composure and that I am through."

Zverev, who had 26 winners and broke Grenier’s serve six times, won his Madrid titles in 2018 and ’21. He is 21-3 in the tournament, having reached the quarterfinals in all five previous appearances.

Fifth-seeded Andrey Rublev improved to 10-1 on clay this season with a 6-2, 7-5 win over Yoshihito Nishioka. Rublev, who reached the quarterfinals in Madrid last year, won the Monte Carlo Masters two weeks ago.

He next faces Karen Khachanov, the 10th-seeded player who defeated home-crowd favorite Roberto Bautista Agut 7-5, 4-6, 6-3 by winning the final three games in a match that lasted almost three hours.