Michael Phelps wins 19th Olympic gold, Katie Ledecky breaks record

    By James Masters, CNN

    Updated 1641 GMT (0041 HKT) August 8, 2016

    Michael Phelps and Caeleb Dressel of United States celebrate their win the men's 4 x 100m freestyle relay on day 2 of the Rio 2016 Olympic Games on Sunday, August 7.
    Photos: Rio Olympics: Day 2
    Michael Phelps and Caeleb Dressel of United States celebrate their win the men's 4 x 100m freestyle relay on day 2 of the Rio 2016 Olympic Games on Sunday, August 7.
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    The United States' Katie Ledecky celebrates after winning the gold medal in the women's 400m freestyle final.
    Photos: Rio Olympics: Day 2
    The United States' Katie Ledecky celebrates after winning the gold medal in the women's 400m freestyle final.
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    American gymnast Simone Biles leads the field in the women's individual all-around competition at the end of the second day of the Olympics.
    Photos: Rio Olympics: Day 2
    American gymnast Simone Biles leads the field in the women's individual all-around competition at the end of the second day of the Olympics.
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    Serbia's Novak Djokovic hangs his head after losing a point during his first round singles tennis match against Argentina's Juan Martin Del Potro. The Argentinian beat Djokovic 7-6, 7-6.
    Photos: Rio Olympics: Day 2
    Serbia's Novak Djokovic hangs his head after losing a point during his first round singles tennis match against Argentina's Juan Martin Del Potro. The Argentinian beat Djokovic 7-6, 7-6.
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    Sarah Sjostrom of Sweden celebrates winning gold and setting a new world record in the women's 100m butterfly.
    Photos: Rio Olympics: Day 2
    Sarah Sjostrom of Sweden celebrates winning gold and setting a new world record in the women's 100m butterfly.
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    Uzbekistan's Oksana Chusovitina performs on the balance beam during the artistic gymnastics women's qualification round. At 41, she is the oldest gymnast to ever compete in the Olympics.
    Photos: Rio Olympics: Day 2
    Uzbekistan's Oksana Chusovitina performs on the balance beam during the artistic gymnastics women's qualification round. At 41, she is the oldest gymnast to ever compete in the Olympics.
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    Daniele Garozzo of Italy celebrates after defeating Alexander Massialas of the United States, winning the gold medal at the men's individual foil fencing event.
    Photos: Rio Olympics: Day 2
    Daniele Garozzo of Italy celebrates after defeating Alexander Massialas of the United States, winning the gold medal at the men's individual foil fencing event.
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    Venus Williams talks with her sister Serena after losing a point against Lucie Safarova and Barbora Strycova of the Czech Republic. The Americans, defending their title, <a href="http://cnn.com/2016/08/07/tennis/serena-venus-williams-tennis-rio-2016/index.html" target="_blank">lost the first-round doubles match 6-3 6-4</a>.
    Photos: Rio Olympics: Day 2
    Venus Williams talks with her sister Serena after losing a point against Lucie Safarova and Barbora Strycova of the Czech Republic. The Americans, defending their title, lost the first-round doubles match 6-3 6-4.
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    Anna van der Breggen of the Netherlands celebrates <a href="http://cnn.com/2016/08/07/sport/rio-olympics-womens-road-race-anna-van-der-breggen/index.html" target="_blank">after winning the women's road race.</a> Her teammate Annemiek van Vleuten was hospitalized after crashing while in the lead.
    Photos: Rio Olympics: Day 2
    Anna van der Breggen of the Netherlands celebrates after winning the women's road race. Her teammate Annemiek van Vleuten was hospitalized after crashing while in the lead.
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    Majlinda Kelmendi of Kosovo (blue) competes with Odette Giuffrida of Italy during the women's 52 kg judo gold medal final. Kelmendi <a href="http://cnn.com/2016/08/07/sport/majlinda-kelmendi-kosovo-olympics/index.html" target="_blank">won Kosovo's first ever Olympic medal.</a>
    Photos: Rio Olympics: Day 2
    Majlinda Kelmendi of Kosovo (blue) competes with Odette Giuffrida of Italy during the women's 52 kg judo gold medal final. Kelmendi won Kosovo's first ever Olympic medal.
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