FORT LAUDERDALE — American swimmer Gretchen Walsh lowered her own world record in the women's 100m butterfly to 54.33 seconds at the Fort Lauderdale Open in Florida. The swim trimmed 0.27 seconds from her previous mark of 54.60 and was the fourth time she has broken the world record in the event.

Walsh has now bettered her own 100m butterfly world record three times in 12 months, including twice in one day at a previous meeting. In May, she became the first woman to swim the event in under 55 seconds when she clocked 54.60.

Walsh posted on Instagram following the race: "Must be magic or something out here... let's make this an annual thing, shall we?" In a separate post, she wrote, "Could not be more grateful for the WR, the crowd, and the pool."

Walsh owns the 13 fastest times in the history of the women's 100m butterfly and more than one third of all sub-56-second swims ever recorded in the event. She also holds the short-course world records in the 50m butterfly, the 100m butterfly and the 50m freestyle.

At the Paris Olympics, Walsh finished second in the women's 100m butterfly behind compatriot Torri Huske, who took the gold medal. The Fort Lauderdale performance extends a dominant stretch for Walsh, who has broken the world record four times in total and twice in a single day at one previous competition. Sarah Sjostrom previously swam the event in 55.48 seconds at the 2016 Olympics, a mark that stood as a reference point before Walsh's sub-55-second breakthrough in May.