Thierry Ascione (French: [tjɛʁi asjɔn]; born 17 January 1981) is an ATP tennis coach and a former professional player from France. He reached a career-high singles ranking of World No. 81 in February 2004.

He turned pro in 2000 and retired in September 2010.

He played Roger Federer in the second round of Roland Garros 2007, saving five match points in the third set and holding two set points before eventually losing in straight sets.

He coached the former World No. 3 WTA player, Elina Svitolina. He was also coach to former World No. 5 ATP player Jo-Wilfried Tsonga and former World No.7 Richard Gasquet.^[1]

Since 2021 he coached Ugo Humbert (until 2022)^[2] and also Lucas Pouille^[3] (until 2024)^[4].^[1][5]

• Began playing tennis at age eight with his older brother, Frédéric.
• His uncle was European boxing champion and another uncle was World military boxing champion.
• Was Marat Safin's last ATP match win after holding 3 match points at the 2009 BNP Paribas Masters in Paris, Bercy.
• He is the godfather of Julien Boutter's son, Oscar.

Result	W–L	Date	Tournament	Tier	Surface	Opponent	Score
Loss	0–1	Jul 2001	France F13, Aix-Les-Bains	Futures	Clay	Florent Serra	2–6, 3–6
Win	1–1	Aug 2001	France F14, Valescure	Futures	Hard	Julien Couly	6–4, 2–6, 6–2
Win	2–1	Dec 2002	Spain F22, Orense	Futures	Hard	Roko Karanusic	walkover
Win	3–1	Feb 2003	Andrézieux, France	Challenger	Hard	Karol Beck	6–4, 6–2
Loss	3–2	Mar 2003	France F8, Melun	Futures	Carpet	Peter Wessels	walkover
Win	4–2	Jul 2003	Helsinki, Finland	Challenger	Clay	Igor Andreev	2–6, 6–1, 6–3
Win	5–2	Feb 2005	Andrézieux, France	Challenger	Hard	Stan Wawrinka	6–1, 6–3
Win	6–2	Jun 2005	Reggio Emilia, Italy	Challenger	Clay	Martin Vassallo Arguello	6–3, 6–0
Win	7–2	Aug 2005	Bronx, United States	Challenger	Hard	Brian Vahaly	6–2, 6–3
Win	8–2	Feb 2007	France F3, Bressuire	Futures	Hard	Daniel Munoz De La Nava	6–2, 7–6(7–5)
Win	9–2	May 2007	Rome, Italy	Challenger	Clay	Victor Crivoi	6–3, 6–3
Loss	9–3	Jul 2007	Montauban, France	Challenger	Clay	Michael Lammer	6–1, 3–6, 6–7(4–7)
Loss	9–4	Jul 2007	Mantova, Italy	Challenger	Clay	Alessio Di Mauro	5–7, 6–7(6–8)
Win	10–4	Oct 2007	Andrézieux, France	Challenger	Hard	Jose Acasuso	7–6(8–6), 2–6, 6–2
Win	11–4	Mar 2008	Cherbourg, France	Challenger	Hard	Kristian Pless	7–5, 7–6(7–5)
Loss	11–5	Mar 2009	Cherbourg, France	Challenger	Hard	Arnaud Clément	2–6, 4–6
Loss	11–6	Aug 2009	Vigo, Spain	Challenger	Clay	Thiemo de Bakker	4–6, 6–4, 2–6
Loss	11–7	Oct 2009	Rennes, France	Challenger	Carpet	Alejandro Falla	3–6, 2–6

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Loss	0–1	Jul 1999	France F8, Aix les Bains	Futures	Clay	Marc-Olivier Baron	Julien Cassaigne Nicolas Mahut	3–6, 6–7
Win	1–1	Jan 2002	France F2, Angers	Futures	Clay	Stephane Huet	Oscar Hernandez Perez German Puentes-Alcaniz	4–6, 7–6(7–2), 6–2
Win	2–1	Apr 2002	Greece F1, Syros	Futures	Hard	Florent Serra	Karol Beck Michal Mertinak	3–6, 6–4, 6–2
Loss	2–2	Oct 2002	France F20, Saint Dizier	Futures	Hard	Stephane Huet	Jan Mertl Pavel Riha	4–6, 4–6
Loss	2–3	Dec 2002	Spain F21, Ponte Vedra	Futures	Clay	Thomas Oger	Carlos Martinez-Comet German Puentes-Alcaniz	2–6, 6–4, 4–6
Loss	2–4	Jan 2003	France F1, Grasse	Futures	Clay	Jerome Haehnel	Nicolas Mahut Edouard Roger-Vasselin	3–6, 6–1, 2–6
Win	3–4	May 2004	Aix-en-Provence, France	Challenger	Clay	Jean-Francois Bachelot	Federico Browne Rogier Wassen	6–4, 5–7, 6–4
Win	4–4	Jul 2006	Tampere, Finland	Challenger	Clay	Edouard Roger-Vasselin	Lauri Kiiski Tero Vilen	5–7, 6–2, [12–10]
Loss	4–5	Jan 2007	Nouméa, New Caledonia	Challenger	Hard	Edouard Roger-Vasselin	Alex Kuznetsov Phillip Simmonds	6–7(5–7), 3–6

• Thierry Ascione at the Association of Tennis Professionals
• Thierry Ascione at the International Tennis Federation
• Thierry Ascione at the Davis Cup
• Ascione world ranking history