Mark Chay Jung Jun (simplified Chinese: 蔡荣俊; born 18 February 1982) is a Singaporean freestyle swimmer who has represented the country in the SEA Games and Summer Olympics. His international swimming career began at the 1997 SEA Games and concluded at 2005 SEA Games. He has competed in a total of seven SEA Games, two Asian Games, two Commonwealth Games and two Olympics.

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Mark Chay

Personal information
Full name	Mark Chay Jung Jun
Born	(1982-02-18) February 18, 1982 (age 42) Singapore
Sport
Sport	Swimming
Medal record Representing  Singapore SEA Games 2001 Kuala Lumpur 200m freestyle 2005 Laguna 4x100m freestyle relay 2005 Laguna 4x200m freestyle relay 1999 Brunei 200m freestyle 2003 Hanoi 200m freestyle 2003 Hanoi 100m backstroke 2005 Laguna 100m backstroke 1999 Brunei 100m freestyle 2001 Kuala Lumpur 100m freestyle

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He has been awarded "Singapore Sportsboy of the Year" in 2000, and Sportsman of the Year in 2001. Chay competed and studied at Brigham Young University in Provo, Utah. He was the Mountain West Conference Champion. Chay graduated from Brigham Young University with a degree in Communications. Chay retired from swimming in July 2007.

On 14 January 2021, Chay was chosen as one of the 9 Nominated Members of Parliament (NMP) for the 14th Parliament of Singapore, which began on 21 January 2021.^[1] After his appointment was announced, Chay said that he intends to speak on sports as an agent of social change and a way to unify a nation, prompted by the impact of the COVID-19 pandemic on Singapore's sports scene. In addition, Chay plans to speak on economic issues too.^[2][3]