Wonderful medal for the Hungarian Men's 4x100m Freestyle Relay team. Katie Ledecky got two, the United States got three golden medals whithin just one hour. Sun Yang completed a hat trick in the Men's 400m Freestyle.
Men's 400m Freestyle
Sun Yang (CHN) completed a hat trick in the men's 400m freestyle at the World Championships. He had also won this event in Barcelona in 2013 and in Kazan 2015.
Sun became the second swimmer in history to win this event at three different world championships.
Ian Thorpe (AUS) won the men's 400m freestyle at three successive world championships, in Perth in 1998, in Fukuoka in 2001 and in Barcelona in 2003.
Sun collected his eighth gold medal at world championships, which saw him enter the top 10 all-time in the competition. Five other men and another five women have also won at least eight.
Sun's eight gold medals in total is the most ever by any swimmer representing an Asian country, male or female.
Olympic champion Mack Horton (AUS) came second and this brought an end to a streak of three world titles by the reigning Olympic champion in this event.
Horton's was Australia’s first medal in this event since a silver for Grant Hackett (AUS) in 2007. Between 1994 and 2005, Australia won five straight golds in this event.
Women's 400m Freestyle
Katie Ledecky joined several other female swimmers who have won at least one gold at three different world championships. Natalie Coughlin (USA) is the only woman who has struck gold at more different world championships (six).
Ledecky completed the world championships hat trick in this event, which she also won in 2013 and 2015.
Ledecky became the third woman to win the same individual event at three different world championships, joining Katinka Hosszú (HUN) in the women's 400m individual medley and Sarah Sjöström (SWE) in the women's 100m butterfly.
For Ledecky, it was her 10th gold medal at world championships. Later on the night, she would add a record equalling 11th in the women's 4x100m freestyle relay.
Leah Smith (USA) took silver to give Team USA their first world championships double in this event since 1973, when Heather Greenwood (USA) and Keena Rothhammer (USA) occupied the top two spots.
No country had done the double in this event since East Germany in 1986.
Men's 4x100m Freestyle
United States won the world championship gold medal in this event for the first time since 2009.
The US had seen Australia (2011) and France (2013 and 2015) win the gold in this event since 2009.
The US claimed their 12th gold medal in this event, which is 10 more than the next most prolific country.
Brazil took silver. This was only Brazil’s second medal in this event at the world championships. The first was a bronze in Rome in 1994.
Hungary claimed their first swimming medal at Budapest in 2017. It is also the first decoration in both gender for Hungary in this event.
Women's 4x100m Freestyle
Katie Ledecky (USA) won her 11th gold medal at world championships, equalling the record by a female swimmer, held by countrywoman Missy Franklin (USA).
Earlier in the day, Ledecky had won her 10th by emerging victorious in the women's 400m freestyle.
Ledecky has now won all 11 world championship events she has entered. She has also won 16 of 17 events she has entered at world championships or Olympic Games. The only of the 17 she had to settle for silver in was the women's 4x100m freestyle relay at the Rio Olympic Games last year.
Sarah Sjöström (SWE) registered the first world record improvement in swimming at the 2017 World Championships.
Her opening leg time of 51.71 improved the previous record by Cate Campbell by 35 hundredths of a second. It was the biggest improvement since 27 March 2008, when Libby Trickett (AUS) took 42 hundredths off the mark by Britta Steffen (GER).
Sjöström is the first swimmer from Sweden to hold the world record in the women's 100m freestyle.
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