ADAM PEATY

China dominated the second day of the swimming world championships by winning back-to-back gold medals in the first 10 minutes of the session.

Caeleb Dressel failed to qualify for the biggest swim meet of the year.

U.S. Open champion Emma Raducanu has been honored by Queen Elizabeth II in the British monarch’s annual New Year’s list following the teenager’s breakthrough performance at Flushing Meadows.

Katie Ledecky made more history for the U.S. in the pool.

The Olympic debut of the 4x-100-meter mixed medley relay lived up to its promise of utter chaos and unpredictability.

Adam Peaty cashed in as the surest bet at the Olympic pool, winning the 100-meter breaststroke to earn Britain's first gold of the Tokyo Games.

Caeleb Dressel got started on his quest for six gold medals in swimming, while Katie Ledecky found herself in a very unusual position: Second place.

Clive Rose/Getty Images(CNN) - Americans Regan Smith and Caeleb Dressel claimed two of the five individual swimming world records that were set this week at the world championships in Gwangju, South Korea. The first of Phelps' records was broken by Hungarian swimmer Kristof Milak, 19, in the 200-meter butterfly with a time of 1:50.73, beating Phelps' 1:51.51 from Rome in 2009. Dressel, 22, broke the second of Phelps' records with a time of 49.50 in the 100-meter butterfly, topping the 49.82 Phelps also swam in Rome in 2009. The trend continued when Smith, 17, broke Missy Franklin's world record in the 200-meter backstroke with a time of 2:03.35. Phelps' lone individual world record left standing is the 400 meters in the individual medley.