Swimming’s biggest names are competing at the world championships in Singapore, including Katie Ledecky, Summer McIntosh, Léon Marchand and a 12-year-old from China who could take home a medal.

Leon Marchand will be in the water for the first time on Wednesday at the World Aquatics Championships in the men's 200 IM.

Alexy and Popovici are the only two to have clocked a sub-47 time this season, with both of their performances coming last month. Alexy set a new U.S. Open record with a time of 46.99 to win the national title, while Popovici set a new European record and the fastest time in the world this year with a 46.71.

Canada's Summer McIntosh claimed her second title in two days at the world championships in Singapore with victory in the women's 200 metres individual medley on Monday, while Chinese 12-year-old sensation Yu Zidi just missed out on a medal.

Canadian Olympic medallists Kylie Masse and Taylor Ruck finished off the podium in the women's 100-metre backstroke final at the World Aquatics Championships in Singapore on Tuesday.

Katie Ledecky vs. Summer McIntosh in the 800-meter freestyle is the highlight of the first major international competition since Paris.

Summer McIntosh continued to take the swimming world by storm on Monday, winning her second gold medal in two days to keep up her bid to make World Aquatics Championship history.

The attention was on the middle of the pool in the women’s 100 breaststroke final at the World Championships. That was fine by Anna Elendt.