Question: Ryan Held, is an American freestyle swimmer who specializes in the sprint events, in the final he split 47.73 on the third leg, winning the gold medal together with Caeleb Dressel, Nathan Adrian and who, which American former competitive swimmer and the most decorated Olympian of all time, with a total of 28 medals?
Context: Sun Yang (; ; born 1 December 1991) is a Chinese Olympic and world-record-holding competitive swimmer.  In 2012, he became the first Chinese man to win an Olympic gold medal in swimming.  Sun is the first male swimmer in history to earn Olympic and World Championship gold medals at every freestyle distance from 200 metres to 1500 metres.  A three-time Olympic gold medalist and nine-time world champion, he is also the most decorated Chinese swimmer in history.  "NBC Sports" described Sun as "very arguably the greatest freestyle swimmer of all time." Caeleb Remel Dressel (born August 16, 1996) is an American freestyle and butterfly swimmer who specializes in the sprint events.  Dressel is a two-time Olympic gold medalist and currently holds American records in 50-meter and 100-meter freestyle and the 50-meter butterfly (long course), as well as the world record in the 4×100 meter mixed freestyle and medley relays (long course).  He won seven gold medals at the 2017 World Aquatics Championships in Budapest. Park Tae-hwan (Korean: 박태환, ] ; born September 27, 1989) is a South Korean competitive swimmer who is an Olympic gold medalist and world champion.  He has four Olympic medals, five world titles, and 20 Asian Games medals.  He won a gold medal in the 400-meter freestyle and a silver in the 200-meter freestyle events at the 2008 Summer Olympics.  He also won two silver medals at the 2012 Summer Olympics in the 200- and 400-meter freestyle.  He is the first Asian swimmer to claim a gold medal in the men's 400-meter freestyle, and the first-ever South Korean swimmer to win any Olympic medal in swimming.  He also holds 3 Asian Records, all in Men's Freestyle.  He is best known for his impressive range and versatility, as he is able to compete at international level in 100-, 200-, 400- and 1,500-meter freestyle. Madeline Jane "Maya" DiRado - Andrews (born April 5, 1993) is an American former competitive swimmer who specialized in freestyle, butterfly, backstroke, and individual medley events.  She attended and swam for Stanford University, where she won NCAA titles in the 200 and 400 yard individual medley in 2014 and graduated with a degree in management science and engineering.  At the 2016 US Olympic Trials, DiRado qualified to swim the 200 meter and 400 meter individual medley events, as well as the 200 meter backstroke, at the 2016 Summer Olympics.  At the 2016 Summer Olympics in Rio de Janeiro, she won a gold medal in the women's 4x200 meter freestyle relay, a silver medal in the 400 meter individual medley, a bronze medal in the women's 200 meter individual medley, and a gold medal in the 200 meter backstroke.  Following the Olympics, DiRado retired from the sport. César Augusto Cielo Filho (] , born 10 January 1987) is a Brazilian competitive swimmer who specializes in sprint events.  He is the most successful Brazilian swimmer in history, having obtained three Olympic medals, winning six individual World Championship gold medals and breaking two world records. Johan Bontekoe (1 July 1943 – 25 March 2006) was a Dutch freestyle swimmer who won a gold medal in the 400 meter event at the 1962 European Aquatics Championships.  This was the second ever European gold medal for a Dutch male swimmer after 1938 (Kees Hoving).  He also competed in the 1964 Summer Olympics but failed to reach the finals.  Meanwhile, he was the leading middle and long distance freestyle swimmer in the Netherlands, winning almost all 200–1500 m events and setting 28 national records between 1960 and 1964.  After retiring, he worked in a bank, but also remained associated with the Dutch swimming federation.  He suffered from ill health in his last years, and died of pneumonia at the age 62. Ryan Held (born June 27, 1995) is an American freestyle swimmer who specializes in the sprint events.  At the 2016 US trials he qualified for the 2016 Summer Olympics as a member of the 4×100 meter freestyle relay team.  In the Olympic heats, he swam a split time of 47.79 on the second leg, impressing the coaching staff enough to give him the nod to swim in the final.  In the final he split 47.73 on the third leg, winning the gold medal together with Caeleb Dressel, Michael Phelps, and Nathan Adrian.  Held's emotional outpouring on the medal stand was widely broadcast and made him a social media darling.  He attended Christ the King grade school in Springfield, Illinois and attended high school at Sacred-Heart Griffin where he graduated in 2014.  During his senior year in 2014, Held was named Illinois State Swimmer of the Year. Blake Pieroni (born November 15, 1995) is an American competition swimmer who specializes in freestyle events.  At the US Olympic Trials, he qualified for the 2016 Summer Olympics in Rio de Janeiro as a 4×100 meter freestyle relay swimmer.  In the heats, he swam a split time of 48.39 on the third leg, and the team went on to win the gold medal. Michael Fred Phelps II (born June 30, 1985) is an American former competitive swimmer and the most decorated Olympian of all time, with a total of 28 medals.  Phelps also holds the all-time records for Olympic gold medals (23), Olympic gold medals in individual events (13), and Olympic medals in individual events (16).  In winning eight gold medals at the 2008 Beijing Games, Phelps broke fellow American swimmer Mark Spitz's 1972 record of seven first-place finishes at any single Olympic Games.  At the 2004 Summer Olympics in Athens, Phelps had already tied the record of eight medals of any color at a single Games by winning six gold and two bronze medals.  At the 2012 Summer Olympics in London, Phelps won four gold and two silver medals, and at the 2016 Summer Olympics in Rio de Janeiro, he won five gold medals and one silver.  This made him the most successful athlete of the Games for the fourth Olympics in a row. Rebecca Adlington, OBE (born 17 February 1989) is an English former competitive swimmer who specialised in freestyle events in international competition.  She won two gold medals at the 2008 Summer Olympics in the 400-metre freestyle and 800-metre freestyle, breaking the 19-year-old world record of Janet Evans in the 800-metre final.  Adlington was Britain's first Olympic swimming champion since 1988, and the first British swimmer to win two Olympic gold medals since 1908.  She won bronze medals in both the women's 400-metre and 800-metre freestyle events in the 2012 Summer Olympics in London.
Answer: Michael Phelps