Gabriel Debru
Gabriel Debru is a French tennis player. He has a career-high ATP singles ranking of No. 233 achieved on 17 March 2025 and a best doubles ranking of No. 273 reached on 4 November 2024.
Junior career
Debru had remarkable results on ITF junior circuit, maintaining a 74–25 singles win-loss record. He won a major jr. title in singles, at the 2022 French Open. He was also a runner-up in boys' doubles, at 2022 Wimbledon. As a result, he reached an ITF junior combined ranking of world No. 1 on 11 July 2022.Professional career
2022: Major qualifying debut
Debru made his debut at the 2022 French Open qualifying round, winning against compatriot Arthur Fils but then losing in the second round.2023: First ITF title and Challenger final
Debru reached his first Challenger quarterfinal in his first appearance of the year, at the Oeiras Indoors, Portugal. 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.In June, 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, Debru won his first ITF title in Gubbio, Italy by defeating Federico Arnaboldi in the final. He had reached the semifinals the year prior.
In August, Debru reached his first final on the ATP Challenger Tour in Prague, as a qualifier, losing to Rudolf Molleker in the championship match.
2024: Challenger titles, Top 250 debut
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, Rei Sakamoto and Learner Tien became the youngest champions of 2024 at that level.In August, Debru won his second Challenger singles title in Como, defeating Ignacio Buse in the final. He became the third-youngest Frenchman to win multiple Challenger trophies, joining former Top 10 players Richard Gasquet and Gael Monfils. In October, Debru won his maiden Challenger doubles title in Saint-Brieuc, partnering with Geoffrey Blancaneaux.
2025-2026: College years
Debru announced he would join the University of Illinois in the 2025-26 school year where his brother Mathis already played.Grand Slam performance timeline
Singles
ATP Challenger Tour finals
Singles: 3 (2 titles, 1 runner-up)
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score | ||||||||||||||||||||||||||||||||||||||||||||||
| Loss | 0–1 | 2023 IBG Prague Open - Singles| | Prague Open, Czech Republic | Challenger | Clay |  dts|Jul 2024Doubles: 1 (title)
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dts|Jul 2024