American Katie Ledecky has won nine Olympic gold medals and is a 21-time world champion, but the 28-year-old swimmer is not satisfied with what she has achieved.
At the Pro Swim Series tournament in Fort Lauderdale, she swam the 800-meter freestyle in 8:04.12 minutes, which is faster than her own and world record from the 2016 Olympic Games in Rio de Janeiro (8:04,79).
At the same tournament, in two races in the 100-meter butterfly, American Grethen Walsh broke her personal and world record twice.
In the qualifications, she swam 55,09 seconds, nine hundredths faster than the record she set last year.
In the final, Walsh was the first to "go" under 55 seconds, so the new record is 54,60 seconds.
Walsh won silver in that discipline at the Paris Olympics.
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