The 21st century
Canada · born Montreal, 2001 · right-handed, 2.03 m · 's-Hertogenbosch champion in 2025, his first ATP title
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2025
's-Hertogenbosch champion, his first ATP Tour title
1st
His first tour-level event on grass; he had never won an ATP match on the surface before that week
7-5, 7-6
Final against Zizou Bergs, after saving three set points in the tiebreak
No. 33
Career-high ranking, 18 August 2025
2.03 m
Height, as listed by the ATP
Gabriel Diallo was born in Montreal in 2001 to a Guinean father, Moubassirou, and a Ukrainian mother, Iryna, who had moved to Canada. One of his early coaches was Sam Aliassime, the father of Félix Auger-Aliassime. He played college tennis at the University of Kentucky, where he became the seventh player in the school's history to earn All-American honours in singles and doubles in the same season. He turned professional at the end of 2022.
He won his first Challenger title at Granby in 2022, beat Lorenzo Musetti for Canada at the 2023 Davis Cup Finals and reached the third round of the 2024 US Open as a qualifier. In October 2024 he reached his first ATP final, in Almaty, and entered the top 100. In 2025 he reached the Madrid quarter-finals as a lucky loser and in June won his first title, on grass at 's-Hertogenbosch. He rose to a career-high No. 33 in August 2025.
His 2026 season was harder: by early November he had a 10-19 tour-level record for the year and was ranked No. 121. He is coached by Jonas Björkman and Johan Ortegren.
| 's-Hertogenbosch 2025 | Beat Aleksandar Vukic, the sixth seed Jordan Thompson after saving two match points, the third seed Karen Khachanov, the second seed Ugo Humbert, and Zizou Bergs 7-5, 7-6 in the final. He saved three set points in the second-set tiebreak, from 4-6 down, and won on his second match point |
|---|---|
| Firsts | His first ATP title came at his first tour-level grass event. He was the first Canadian man to reach the 's-Hertogenbosch singles final, the fourth Canadian man this century to win an ATP singles title and, according to the ATP, the first Canadian man to win a grass-court title since 1993 |
| Wimbledon 2025 | Beat Daniel Altmaier in the first round and lost to the fifth seed Taylor Fritz in five sets in the second |
| Earlier grass | Reached the quarter-finals of the Surbiton Challenger in 2023, beating the top seed Dan Evans |
| 's-Hertogenbosch (Rosmalen) | ||
|---|---|---|
| 2025 | Men's singles Rosmalen Grass Court Championships | |
Leading grass titles only: the grass majors, tour-level grass events since 1968 and the leading grass championships before 1968. †single source; ‡ sources disagree. Roll of champions
"It's something that you dream of for your whole life, to win an ATP Tour title"
The person behind the player.
's-Hertogenbosch, June 2025
At the trophy ceremony he thanked a racquet stringer who had written his name as "Diablo" instead of Diallo. Earlier in the week he had warned the stringer that he would mention it if he got a microphone at the end of the tournament.
Source: ATP TourMontreal
He credits his parents, who "took a risk moving to Montreal to give me a chance", and says he tries to repay them by "playing my butt off".
Source: ATP Tour's-Hertogenbosch, June 2025
His opponent in the final, Zizou Bergs, is a good friend. "I love your team," Bergs told him at the ceremony. Diallo planned to celebrate with his team over a beer and then travel on to Queen's.
Source: ATP TourOff court
"I don't take things too seriously, I like to joke around and be laid back," he said. He speaks French and English and began missing school at ten to practise and compete.
Source: ATP TourLexington, Kentucky
He played for the University of Kentucky and reached the quarter-finals of the 2022 NCAA singles championships before turning professional at the end of that year.
Source: ATP TourFree membership: player news, the grass court Atlas, the rankings and the grass season calendar.
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