Gabriel Debru (born 21 December 2005) is a French tennis player. He has a career high ATP singles ranking of world No. 235 achieved on 24 February 2025 and a doubles ranking of No. 273 achieved on 4 November 2024.^[2]

In 2022, Debru won the French Open's boys single title.^[3] Later that year, he reached the finals of the Wimbledon's boys doubles title, playing along with Paul Inchauspé.

In May 2022, Debru made his debut at the French Open qualifying round, winning against Arthur Fils but then losing in the second round.

He reached his first Challenger quarterfinal in his first tournament of the year, at the Oeiras Indoors. He reached another quarterfinal a month later at the Challenger La Manche in Cherbourg, defeating Kenny de Schepper before falling to British Jan Choinski. At his second French Open qualifying appearance he lost in the first round to Dominican Nick Hardt.

At the Open Sopra Steria de Lyon Debru made it to his first Challenger semifinal having defeated former Top 20 Benoit Paire, however he then lost to Alexander Ritschard.

In July 2023, Debru won his first ITF title in Gubbio, Italy defeating Federico Arnaboldi in the final. He had reached the semifinals the year prior.

In August 2023, Debru reached his first final on the ATP Challenger Tour in Prague, as a qualifier, losing to Rudolf Molleker in the final.

In July, Debru won his maiden Challenger title in Troyes, defeating third seed Timofey Skatov in the final. At 18 years and 6 months, he became the youngest French player to win a Challenger title since 2017. The only French players to win at a younger age were Richard Gasquet, Fabrice Santoro, Gael Monfils and Corentin Moutet. João Fonseca, Joel Schwärzler, Debru and Learner Tien became the youngest champions of 2024 at that level.^[4][5]

In August, Debru won his second Challenger singles title in Como, defeating Ignacio Buse in the final.^[6] He became the third-youngest Frenchman to win multiple Challenger trophies (since 1978), joining former Top 10 players Richard Gasquet and Gael Monfils.^[7] In October, Debru won his maiden Challenger doubles title in Saint-Brieuc, partnering with Geoffrey Blancaneaux.^[8]

Result	W–L	Date	Tournament	Tier	Surface	Opponent	Score
Loss	0–1	Aug 2023	Prague, Czech Republic	Challenger	Clay	Rudolf Molleker	2–6, 2–6
Win	1–1	Jul 2024	Troyes, France	Challenger	Clay	Timofey Skatov	6–3, 6–7(1–7), 7–5
Win	2–1	Aug 2024	Como, Italy	Challenger	Clay	Ignacio Buse	6–1, 2–6, 6–3

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Win	1–0	Oct 2024	Saint-Brieuc, France	Challenger	Hard (i)	Geoffrey Blancaneaux	Matěj Vocel Jakub Paul	3–3, def.

Result	W–L	Date	Tournament	Tier	Surface	Opponent	Score
Win	1–0	Jul 2023	M15 Gubbio, Italy	WTT	Clay	Federico Arnaboldi	6–4, 3–6, 6–3
Win	2–0	Jul 2024	M25 Uriage-les-Bains, France	WTT	Clay	Maxime Chazal	6–1, 6–3
Win	3–0	Nov 2024	M25 Heraklion, Greece	WTT	Hard	Rémy Bertola	3–6, 6–4, 6–2

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Win	1–0	Feb 2023	M15 Grenoble, France	WTT	Hard (i)	Paul Inchauspé	Maxence Beaugé Émilien Voisin	6–2, 6–3
Loss	1–1	May 2023	M15 Antalya, Turkey	WTT	Clay	Edas Butvilas	Mateo del Pino Juan Manuel La Serna	2–6, 6–1, [9–11]
Win	2–1	May 2023	M15 Antalya, Turkey	WTT	Clay	Juan Manuel La Serna	Sean Hess Fermín Tenti	7–6(7–4), 6–3
Loss	2–2	Jul 2024	M25 Uriage-les-Bains, France	WTT	Clay	Tiago Pires	Florent Bax Alexandre Aubriot	3–6, 6–2, [5–10]

Result	Year	Tournament	Surface	Opponent	Score
Win	2022	French Open	Clay	Gilles-Arnaud Bailly	7–6(7–5), 6–3

Result	Year	Tournament	Surface	Partner	Opponents	Score
Loss	2022	Wimbledon	Grass	Paul Inchauspé	Sebastian Gorzny Alex Michelsen	6–7(5–7), 3–6

• Gabriel Debru at the Association of Tennis Professionals
• Profile at ITF