2016 Rio Summer Olympics

Olympic Moments: Michael Phelps Claims 21st Gold Medal

The U.S. women's gymnastics team soars to the top, U.S. swimmers take gold and more from the fourth day of the Rio Olympics.

Townley Haas, Conor Dwyer, Ryan Lochte and Michael Phelps of the U.S. kiss their gold medals for the men's 4 x 200m freestyle relay on day four of the Rio 2016 Olympic Games on Aug. 9. The relay gold is No. 21 for Phelps and his 25th medal overall across five editions of the Games. Richard Heathcote / Getty Images
From left, Townley Haas, Michael Phelps, Ryan Lochte, hidden, and Conor Dwyer huddle together after winning the men's 4 x 200m freestyle relay. BERND THISSEN / EPA
From left, Lauren Hernandez, Madison Kocian, Simone Biles, Alexandra Raisman and Gabrielle Douglas of the U.S., 'The Final Five," as they've nicknamed themselves, wave to fans as they celebrate winning the gold in women's team gymnastics. With two consecutive Olympic golds and world championships titles in 2011, 2014 and 2015, the U.S. women have made a seemingly unbreakable habit of winning. David Ramos / Getty Images
Sarah Sjostrom of Sweden congratulates gold medal winner Katie Ledecky of the U.S. in the women's 200m freestyle final. It was the third medal for Ledecky at the Games. Clive Rose / Getty Images

Polish players jump to block the ball during the men's qualifying volleyball match with Iran.

Caeleb Dressel, left, of the United States leaps into the pool for the the first semifinal of the men's 100m freestyle. Adam Pretty / Getty Images
United States' Lauren Hernandez performs soars through her routine during the artistic gymnastics women's team final. Dmitri Lovetsky / AP
Simone Biles of the United States competes on the balance beam during the artistic gymnastics women's team final. Laurence Griffiths / Getty Images
Doaa Elghobashy of Egypt celebrates while Marta Menegatti of Italy walks away during the women's beach volleyball preliminary Pool A match on Day 4 of the Rio 2016 Olympic Games. Ezra Shaw / Getty Images

Canadian players celebrate their victory after the women's soccer match against Germany.

EVARISTO SA / AFP - Getty Images

Japan's point guard Asami Yoshida heads for the basket next to Turkey's point guard Olcay Cakir during a women's round Group A basketball match.

Azerbaijan's Kamran Shakhsuvarly fights China's Zhao Minggang during a men's middleweight 75-kg preliminary boxing match. Frank Franklin II / AP
Algeria's Ilyas Abbadi pauses during a fight against Congo's Mpi Anauel Ngamissengue during a men's middleweight 75-kg preliminary boxing match. Frank Franklin II / AP

Travis Stevens of the United States and Khasan Khalmurzaev of Russia compete in the men's 81kg gold medal bout.

Ryan Pierse / Getty Images
Kazuyasu Minobe of Japan reacts during the match against Marco Fichera of Italy during the men's epee individual. Dean Mouhtaropoulos / Getty Images
Iran's Zahra Nemati shoots an arrow during the women's competition. JEWEL SAMAD / AFP - Getty Images
United States' Michael Phelps celebrates after winning his 20th gold medal in the men's 200-meter butterfly final during the swimming competitions. Michael Sohn / AP
Xiaoxia Li of China competes against I-Ching Cheng of Chinese Taipei during the women's singles quarterfinal 3 table tennis. Tom Pennington / Getty Images
Benjamin Savsek of Slovenia competes in the men's semifinal canoe single. IVAN ALVARADO / Reuters

Sean Gunn of Zimbabwe competes in the men's preliminary 100m freestyle heat.

PHOTOS: Highlights from Rio Olympics Day Three