BUDAPEST, Hungary — Regan Smith of Lakeville won the 100 backstroke at the swimming world championships on Monday, and Italy’s Thomas Ceccon set a world record in the men’s 100 backstroke.

Smith, who set the current world record in the long-course 200 backstroke South Korea in 2019, won gold in the 100 backstroke, clocking 58.22 to finish 0.18 ahead of Canadian rival Kylie Masse with another American, Claire Curzan, finishing third.

It was the third world championships gold medal for Smith, 20. She won the 200 backstroke with her world-record 2:03:35 in 2019 in South Korea, and was part of the U.S.  4×100-meter medley that won the 2019 gold in a world-record time of 3:50.40. She competed for the U.S. in the 2020 Olympics Games in Tokyo, winning a bronze medal in the 100 backstroke, a silver medal in the 200-meter butterfly, and a silver medal in the 4×100-meter medley relay.

Ceccon stunned the competition in Budapest by clocking 51.60 seconds to shave 0.15 seconds off the previous best mark set by American Ryan Murphy at the 2016 Olympics.

“Yesterday I swam 52.1, very easy,” Ceccon said. “I am feeling good in water and just doing my race, staying calm and focusing on my race. And that’s it.”

Murphy finished second, 0.37 seconds behind, followed by compatriot Hunter Armstrong, 0.38 behind Ceccon.

“Hats off to Thomas,” Murphy said of seeing his record beaten. “That’s a really, really fast time and it’s going to be an exciting couple of years.”

American Katie Ledecky extended her record title haul to 17 with her fourth in the 1,500 freestyle. She never looked threatened and clocked 15:30.15 — just under 10 seconds more than her world record from 2018 — to finish 14.74 seconds ahead of fellow American Katie Grimes.

Ledecky punched the water in delight then embraced her teammate.

“To share this moment with her is really special,” Ledecky said.

The 16-year-old Grimes is the second youngest medalist in the 1,500 at a worlds since Ledecky won it for the first time in 2013.

“I was really nervous leading up to it because it’s my first world championships and Team USA has been doing a great job, so I wanted to keep that going,” Grimes said.

Ledecky also won in 2015 and 2017 and has at least four world titles in the each of the 1,500, 800 and 400 freestyle events. Only compatriot Michael Phelps also won at least four gold medals in three different swimming events at the worlds.

“I don’t think that anyone will be topping Katie for a little while, but I definitely think it’s a goal for everyone moving forward,” said Australia’s Lani Pallister, who finished third, 18.81 off Ledecky’s pace. “She’s definitely set the standard of distance swimming in the world.”

Pallister’s bronze was her country’s first medal in this race. The 1,500 freestyle was the only women’s event at a worlds in which an Australian swimmer had not reached the podium.

Italy’s Simona Quadarella, who was second fastest in qualifying, finished fifth, more than half a minute behind.

Regan Smith got another gold for the United States in the women’s 100 backstroke, clocking 58.22 to finish 0.18 ahead of Canadian rival Kylie Masse with another American, Claire Curzan, finishing third.

Then Italy’s show began with Ceccon.

He is the second Italian man to set a world record in long course swimming after Giorgio Lambert. Lambert held the record in the men’s 200 freestyle from 1989-99.

Italy’s Benedetta Pilato followed up by winning the women’s 100 breaststroke in 1:05.93, 0.05 ahead of Germany’s Anna Elendt and 0.09 ahead of Lithuania’s Rūta Meilutytė.

The 17-year-old Pilato, who couldn’t contain her delight, is the youngest Italian swimmer to win gold at a worlds.

She brought her country’s tally of golds to three, already as many as Italy’s swimmers ever managed at a previous worlds.

Also, Romania’s David Popovici set a world junior record to win the men’s 200 meters in 1:43.21 – 1.26 seconds ahead of the competition.

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