Tony is the son of Henri Estanguet, himself a canoeist who won medals at the Wildwater Canoe World Championships in the 1970s. His elder brother, Patrice Estanguet, won a bronze medal at the 1996 Summer Olympics in Atlanta.
Estanguet has won three Olympic gold medals in the C-1 event, in 2000, 2004 and 2012. In 2004, he won after the referees  decided to award Michal Martikán a two second penalty which pushed him to second place, only 12 hundredths of a second behind Estanguet.
Estanguet was the flag-bearer for France at the 2008 Beijing Summer Olympics opening ceremony. He finished in the 9th position (out of 12 competitors; only the first eight would qualify for the final) in the semi-finals of the C-1 event and was thus eliminated from the final.
At the 2012 London Summer Olympics, he became the first French Olympian to win three gold medals in the same Olympic discipline.
He won twelve medals at the ICF Canoe Slalom World Championships with five golds (C-1: 2006, 2009, 2010; C-1 team: 2005, 2007), six silvers (C-1: 2003, 2005, 2007; C-1 team: 1997, 2003, 2009), and a bronze (C-1 team: 1999).
On November 30 of 2012, he announced that he retired.
- 2010 ICF Canoe Slalom World Championships 12 September 2010 C-1 men's final results. – Retrieved 12 September 2010.
- 12 September 2009 final results of the men's C-1 team slalom event for the 2009 ICF Canoe Slalom World Championships. – Retrieved 12 September 2009.
- 13 September 2009 final results of the men's C-1 event at the 2009 ICF Canoe Slalom World Championships. – Retrieved 13 September 2009.
- DatabaseOlympics.com profile
- ICF medalists for Olympic and World Championships – Part 2: rest of flatwater (now sprint) and remaining canoeing disciplines: 1936–2007.
- Sports-reference.com profile
|Flagbearer for France
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