Gretchen Walsh won her first individual long course world title by nearly breaking her own 100m butterfly world record. Walsh clocked 54.73 seconds at the World Swimming Championships, just off her own record of 54.60 from May 3. She owns the top eight times in history.

It's been a tough go for Team USA at the World Aquatics Championships, but the team won't leave the event without a gold medal. Gretchen Walsh secured the squad's first gold Monday, winning the 100m butterfly and setting a championship-record time in the process.

Maxime Grousset Overtakes Noè Ponti By Three Hundredths in 50 Fly The short course butterfly star from last winter seemed to have the jump on

Men’s 400m Freestyle Gold: Lukas Martens (GER) -- 3:42.35 Silver: Sam Short (AUS) -- 3:42.37 Bronze: Kim Woo-Min (KOR) -- 3:42.60 4. Victor Johnasson (SWE) -- 3:44.68 5. Zhang Zhanshuo (CHN) -- 3:44.82 6. Marco De Tullio (ITA) -- 3:44.92 7. Petar Petrov Mitsin (BUL) -- 3:45.28 8. Oliver Klemet (GER) -- 3:46.86

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

The United States team at the swimming world championships in Singapore is battling a case of “acute gastroenteritis” that compromised performances on the opening day of eight days of competition in the pool.

Watch live coverage of every race at the swimming worlds on CBCSports.ca and CBC Gem, with finals beginning at 7 a.m. ET each day.

Women's semifinals on day two of the World Championships included the 100 breaststroke, led by Kate Douglass, and 100 backstroke.