The recent onslaught on the record books has left just four NAG standards remaining from the 1970s, two from the 1980s, and 13 total from the 20th century.
Regan Smith destroyed her 200 back/200 fly double on Saturday, winning both events by more than two seconds and setting a pair of U.S. Open meet records.
2023 World Champs Preview: Tokyo Olympic Rematch Brewing in Women s 100 Fly swimswam.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from swimswam.com Daily Mail and Mail on Sunday newspapers.