Looking fresh again after taking a few weeks off, U.S. Open champion Dominic Thiem cruised into the third round of the Madrid Open with a comfortable 6-1, 6-3 win over American Marcos Giron on Tuesday.

Thiem was in control from the start at the “Magic Box” center court in what was his first match since March. The fourth-ranked Austrian was coming off early round losses in Doha and Dubai and felt like he needed a break.

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Dominic Thiem of Austria returns the ball to Marcos Giron of the U.S. during their match at the Madrid Open tennis tournament in Madrid, Spain, Tuesday, May 4, 2021. (AP PhotoPaul White)

Looking fresh again after taking a few weeks off, U.S. Open champion Dominic Thiem cruised into the third round of the Madrid Open with a comfortable 6-1, 6-3 win over American Marcos Giron on Tuesday.

Dominic Thiem of Austria prepares to serve to Marcos Giron of the U.S. during their match at the Madrid Open tennis tournament in Madrid, Spain, Tuesday, May 4, 2021. (AP PhotoPaul White)

Thiem, the third seed in Madrid, hasn't won a tournament since breaking through with his first grand slam title at the U.S. Open in September.

Dominic Thiem of Austria returns the ball to Marcos Giron of the U.S. during their match at the Madrid Open tennis tournament in Madrid, Spain, Tuesday, May 4, 2021. (AP PhotoPaul White)

“That’s where I want to be at the top of my game again,” he said. “Two weeks ago, I was not sure if I’m playing here, so the expectations are still super low. A win like today is already a big success, because I get a chance to play another match in a top level, so that will help me again for the next weeks."

Dominic Thiem of Austria returns the ball to Marcos Giron of the U.S. during their match at the Madrid Open tennis tournament in Madrid, Spain, Tuesday, May 4, 2021. (AP PhotoPaul White)

Thiem's next opponent in Madrid will be Australian Alex De Minaur, who advanced after Lloyd Harris had to retire from their match.

Elise Mertens of Belgium reacts after winning a point against Simona Halep of Romania during their match at the Madrid Open tennis tournament in Madrid, Spain, Tuesday, May 4, 2021. (AP PhotoPaul White)

American Taylor Fritz lost 7-5, 5-7, 6-4 in a first-round match against Albert Ramos-Viñolas, who is coming off a title at the Estoril Open. Félix Auger-Aliassime fell 6-1, 6-4 to Casper Ruud.

Simona Halep of Romania serves to Elise Mertens of Belgium during their match at the Madrid Open tennis tournament in Madrid, Spain, Tuesday, May 4, 2021. (AP PhotoPaul White)

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Matteo Berrettini of Italy, right, shakes hands with Fabio Fognini of Italy at the end of their match at the Madrid Open tennis tournament in Madrid, Spain, Tuesday, May 4, 2021.Berrettini won the match 6-3, 6-4. (AP PhotoPaul White)

Matteo Berrettini of Italy, right, shakes hands with Fabio Fognini of Italy at the end of their match at the Madrid Open tennis tournament in Madrid, Spain, Tuesday, May 4, 2021.Berrettini won the match 6-3, 6-4. (AP PhotoPaul White)

Matteo Berrettini of Italy celebrates after defeating Fabio Fognini of Italy 6-3, 6-4 during their match at the Madrid Open tennis tournament in Madrid, Spain, Tuesday, May 4, 2021. (AP PhotoPaul White)

Matteo Berrettini of Italy celebrates after defeating Fabio Fognini of Italy 6-3, 6-4 during their match at the Madrid Open tennis tournament in Madrid, Spain, Tuesday, May 4, 2021. (AP PhotoPaul White)

Matteo Berrettini of Italy returns the ball to Fabio Fognini of Italy during their match at the Madrid Open tennis tournament in Madrid, Spain, Tuesday, May 4, 2021. (AP PhotoPaul White)

Matteo Berrettini of Italy returns the ball to Fabio Fognini of Italy during their match at the Madrid Open tennis tournament in Madrid, Spain, Tuesday, May 4, 2021. (AP PhotoPaul White)

Marcos Giron of the U.S. returns the ball to Dominic Thiem of Austria during their match at the Madrid Open tennis tournament in Madrid, Spain, Tuesday, May 4, 2021. (AP PhotoPaul White)

Marcos Giron of the U.S. returns the ball to Dominic Thiem of Austria during their match at the Madrid Open tennis tournament in Madrid, Spain, Tuesday, May 4, 2021. (AP PhotoPaul White)

“For my game, I need 100% intensity and 100% energy,” the 27-year-old Thiem said. “I’m not the guy who can serve through a match or who can play with a little bit intensity and is still winning. I need 100% in every aspect of my game. I was just not able to put that on court like in Doha, Dubai or towards the end of the Australian Open, so that’s why it was better to take a break.”

Dominic Thiem of Austria returns the ball to Marcos Giron of the U.S. during their match at the Madrid Open tennis tournament in Madrid, Spain, Tuesday, May 4, 2021. (AP PhotoPaul White)

Dominic Thiem of Austria returns the ball to Marcos Giron of the U.S. during their match at the Madrid Open tennis tournament in Madrid, Spain, Tuesday, May 4, 2021. (AP PhotoPaul White)

Thiem, the third seed in Madrid, hasn't won a tournament since breaking through with his first grand slam title at the U.S. Open in September.

“There was no anxiety, but definitely I was uncertain how things will be going,” the two-time finalist in Madrid said.

He said his goal is to be back in top form at the French Open.

Dominic Thiem of Austria prepares to serve to Marcos Giron of the U.S. during their match at the Madrid Open tennis tournament in Madrid, Spain, Tuesday, May 4, 2021. (AP PhotoPaul White)

Dominic Thiem of Austria prepares to serve to Marcos Giron of the U.S. during their match at the Madrid Open tennis tournament in Madrid, Spain, Tuesday, May 4, 2021. (AP PhotoPaul White)

“That’s where I want to be at the top of my game again,” he said. “Two weeks ago, I was not sure if I’m playing here, so the expectations are still super low. A win like today is already a big success, because I get a chance to play another match in a top level, so that will help me again for the next weeks."

Thiem said he will likely be taking more time off going forward in his career.

“Actually last year, the six-months break (because of the coronavirus pandemic), it felt so nice," he said. “It’s definitely something I consider, as well, in the future to better take a little bit more off. I think it’s a good thing to do and especially when you get a little bit older ... The older you get, the more experienced you get, I think it’s good to do a break sometimes. For me, it definitely helped."

Dominic Thiem of Austria returns the ball to Marcos Giron of the U.S. during their match at the Madrid Open tennis tournament in Madrid, Spain, Tuesday, May 4, 2021. (AP PhotoPaul White)

Dominic Thiem of Austria returns the ball to Marcos Giron of the U.S. during their match at the Madrid Open tennis tournament in Madrid, Spain, Tuesday, May 4, 2021. (AP PhotoPaul White)

Thiem's next opponent in Madrid will be Australian Alex De Minaur, who advanced after Lloyd Harris had to retire from their match.

Sixth-seeded Andrey Rublev advanced to the third round by beating American Tommy Paul 6-7 (5), 6-3, 6-4, while Kei Nishikori reached the second round by defeating Karen Khachanov 6-7 (6), 6-2, 6-2.

Eighth-seeded Matteo Berrettini defeated Fabio Fognini 6-3, 6-4 in an all-Italian second-round matchup, while Alexander Bublik beat 11th-seeded Denis Shapovalov 6-4, 5-7, 6-4.

Dominic Thiem of Austria returns the ball to Marcos Giron of the U.S. during their match at the Madrid Open tennis tournament in Madrid, Spain, Tuesday, May 4, 2021. (AP PhotoPaul White)

Dominic Thiem of Austria returns the ball to Marcos Giron of the U.S. during their match at the Madrid Open tennis tournament in Madrid, Spain, Tuesday, May 4, 2021. (AP PhotoPaul White)

American Taylor Fritz lost 7-5, 5-7, 6-4 in a first-round match against Albert Ramos-Viñolas, who is coming off a title at the Estoril Open. Félix Auger-Aliassime fell 6-1, 6-4 to Casper Ruud.

In the round of 16 of the women’s draw, third-seeded Simona Halep, a two-time Madrid champion, was upset by 13th-seeded Elise Mertens, 4-6, 7-5, 7-5 in a match lasting more than two and a half hours at the center court.

Two Americans lost — Aryna Sabalenka defeated Jessica Pegula 6-1, 6-2 and Anastasia Pavlyuchenkova beat Jennifer Brady 7-5, 6-7 (8), 6-3.

Elise Mertens of Belgium reacts after winning a point against Simona Halep of Romania during their match at the Madrid Open tennis tournament in Madrid, Spain, Tuesday, May 4, 2021. (AP PhotoPaul White)

Elise Mertens of Belgium reacts after winning a point against Simona Halep of Romania during their match at the Madrid Open tennis tournament in Madrid, Spain, Tuesday, May 4, 2021. (AP PhotoPaul White)

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Simona Halep of Romania serves to Elise Mertens of Belgium during their match at the Madrid Open tennis tournament in Madrid, Spain, Tuesday, May 4, 2021. (AP PhotoPaul White)

Simona Halep of Romania serves to Elise Mertens of Belgium during their match at the Madrid Open tennis tournament in Madrid, Spain, Tuesday, May 4, 2021. (AP PhotoPaul White)

Matteo Berrettini of Italy, right, shakes hands with Fabio Fognini of Italy at the end of their match at the Madrid Open tennis tournament in Madrid, Spain, Tuesday, May 4, 2021.Berrettini won the match 6-3, 6-4. (AP PhotoPaul White)

Matteo Berrettini of Italy, right, shakes hands with Fabio Fognini of Italy at the end of their match at the Madrid Open tennis tournament in Madrid, Spain, Tuesday, May 4, 2021.Berrettini won the match 6-3, 6-4. (AP PhotoPaul White)

Matteo Berrettini of Italy celebrates after defeating Fabio Fognini of Italy 6-3, 6-4 during their match at the Madrid Open tennis tournament in Madrid, Spain, Tuesday, May 4, 2021. (AP PhotoPaul White)

Matteo Berrettini of Italy celebrates after defeating Fabio Fognini of Italy 6-3, 6-4 during their match at the Madrid Open tennis tournament in Madrid, Spain, Tuesday, May 4, 2021. (AP PhotoPaul White)

Matteo Berrettini of Italy returns the ball to Fabio Fognini of Italy during their match at the Madrid Open tennis tournament in Madrid, Spain, Tuesday, May 4, 2021. (AP PhotoPaul White)

Matteo Berrettini of Italy returns the ball to Fabio Fognini of Italy during their match at the Madrid Open tennis tournament in Madrid, Spain, Tuesday, May 4, 2021. (AP PhotoPaul White)

Marcos Giron of the U.S. returns the ball to Dominic Thiem of Austria during their match at the Madrid Open tennis tournament in Madrid, Spain, Tuesday, May 4, 2021. (AP PhotoPaul White)

Marcos Giron of the U.S. returns the ball to Dominic Thiem of Austria during their match at the Madrid Open tennis tournament in Madrid, Spain, Tuesday, May 4, 2021. (AP PhotoPaul White)