Gauthier Onclin, Belgium’s rising tennis star, has quickly become a name to watch on the ATP Challenger Tour. Known for his relentless work ethic and adaptability across surfaces, Onclin’s journey from junior circuits to Grand Slam qualifiers reflects his growth in a competitive sport.
Here’s an in-depth look at his career, finances, and personal life.
Gauthier Onclin’s Biography
| Category | Details |
|---|---|
| Full Name | Gauthier Onclin |
| Nickname | N/A |
| Born | February 26, 2001 |
| Age | 23 years old |
| College | turned professional in 2018 |
| Nationality | Belgian |
| Height | 5’11” (180 cm) |
| Turned Pro | 2018 |
| Net Worth | $249,259 |
| Prize money | $263,524 |
| Turned pro | 2022 |
| Relationship | Private |
| Instagram Profile | N/A |
Early Career
Gauthier Onclin’s journey into professional tennis began in his hometown of Liège, Belgium, where he developed his skills at local clubs.
Turning pro at 17 in 2018, he bypassed college to focus entirely on climbing the ranks. Under the mentorship of coach Steve Darcis, a former ATP Top 50 player, Onclin honed an aggressive baseline style and a sharp two-handed backhand.
His early years were spent grinding through ITF tournaments, where he quickly made a mark with five titles between 2019 and 2022. The COVID-19 pandemic disrupted his junior career, wiping out his chance to gain grass-court experience during the 2020 season.
Despite this setback, he adapted by dominating on clay and hard courts, showcasing resilience that propelled him to the ATP Challenger Tour.
A pivotal moment came in January 2023 when he reached the semifinals of the BW Open in Belgium, defeating seasoned players and signaling his readiness for higher-level competition
Professional Career
Gauthier Onclin’s professional career has been defined by steady progression and resilience. After turning pro in 2018, he spent his early years honing his skills on the ITF circuit, where he claimed 12 titles by late 2024.
His breakthrough came in 2023 when he reached the BW Open semifinals in Belgium, defeating higher-ranked players like Elias Ymer and making his ATP doubles debut at the European Open paired with Michael Geerts.
Despite pandemic disruptions to his junior grass-court development, Onclin adapted swiftly, avenging a French Open qualifying loss to Thiago Agustin Tirante with a straight-sets Wimbledon qualifier win later that year.
The 2024 season saw Onclin reach his first ATP Challenger final at the Prague Open, falling to former Top 40 player Jiří Veselý. He dominated the ITF circuit late in the year, securing back-to-back titles in Portugal and Tunisia and extending his winning streak to 13 matches.
His improved serve—winning 72% of first-serve points during the 2024 Australian Open qualifiers—marked a tactical evolution. Onclin’s perseverance paid off in 2025 with a Grand Slam main-draw debut at the Australian Open. After a dramatic comeback against Roman Andres Burruchaga in qualifying, he defeated Aleksandar Kovacevic and Mackenzie McDonald to secure his spot.
Though he lost to Reilly Opelka in the first round, his aggressive returns pushed the match to a second-set tiebreak. Currently ranked No. 218, Onclin’s 56–27 record over the past year highlights his consistency, particularly on indoor hard courts (10–3).
Under coach Steve Darcis, he focuses on reducing unforced errors and leveraging his 180 cm frame for angled serves, positioning him as Belgium’s next potential Davis Cup contender.
Gauthier Onclin’s Net Worth Details
Gauthier Onclin’s net worth is estimated to be $249,259 as of 2025.
Career Earnings
| Year | Prize Money |
|---|---|
| 2021 | $32,000 |
| 2022 | $54,000 |
| 2023 | $72,638 |
| 2024 | $81,680 |
| 2025 | $104,307 |
Endorsements
Gauthier Onclin’s sponsorship portfolio remains modest but strategic. Since 2023, he has partnered with Wilson for racquets and gear, leveraging their equipment to refine his baseline power and serve consistency.
In 2024, he secured a deal with Indian Maharadja, a Belgian sportswear brand, for apparel—a collaboration that emerged as his Challenger Tour performances gained traction. While yet a global ambassador, his 2025 Australian Open debut has sparked interest from larger athletic brands, particularly in footwear, where he prioritizes comfort and durability during long matches.
Career Stats
| Stat | Figure |
|---|---|
| Career-High Ranking | No. 194 (2023) |
| ATP Titles (Singles) | 0 |
| ITF Titles | 12 |
| Career Win-Loss | 214–123 |
| Preferred Surfaces | Clay, Indoor Hard |
FAQs
1. What is Gauthier Onclin’s current ATP ranking?
As of February 2025, Gauthier Onclin is ranked No. 218 in ATP singles. His career-high ranking of No. 194 was achieved in September 2023. He competes primarily in Challenger tournaments to improve his standing and aims to break into higher rankings through consistent performances.
2. How old is Gauthier Onclin?
Born on February 26, 2001, in Liège, Belgium, Gauthier Onclin is 23 years old as of 2025. He turned professional in 2018 and has since focused on climbing the ATP rankings through Challenger and ITF circuits.
3. What is Gauthier Onclin’s career-high ATP ranking?
Onclin reached his career-high ATP singles ranking of No. 194 on September 18, 2023. This milestone followed strong performances in 2023, including a semifinal finish at the BW Open and qualifying rounds at Grand Slam tournaments.
4. Who coaches Gauthier Onclin?
Gauthier Onclin is coached by Steve Darcis, a former Belgian ATP player. Darcis has focused on refining Onclin’s serve consistency and tactical approach, particularly on grass and hard courts, to enhance his versatility in tournaments.
5. What is Gauthier Onclin’s playing style?
A right-handed player with a two-handed backhand, Onclin excels in baseline rallies and thrives on clay and indoor hard courts. His agility and stamina complement his powerful serve, which averages 185 km/h, making him a challenging opponent in long matches.
6. How did Gauthier Onclin perform at the 2025 Australian Open?
Onclin qualified for his Grand Slam main-draw debut at the 2025 Australian Open, defeating Roman Burruchaga, Aleksandar Kovacevic, and Mackenzie McDonald. He lost to Reilly Opelka in the first round but showcased resilience, pushing the match to a second-set tiebreak.
7. What are Gauthier Onclin’s career earnings?
Gauthier Onclin has earned $344,625 in career prize money as of 2025. His 2025 earnings include $81,680 from tournaments like the Australian Open, where he made his Grand Slam debut.
8. How many ITF titles has Gauthier Onclin won?
Onclin has won 12 ITF singles titles, with notable victories in 2024 at tournaments in Portugal and Tunisia. These wins underscore his dominance on the ITF circuit and contribute to his steady rise in rankings.
9. Has Gauthier Onclin won any ATP titles?
His closest achievement came at the 2024 Prague Open Challenger, where he reached the final but lost to Jiří Veselý, a former Top 40 player.
10. Where was Gauthier Onclin born?
Gauthier Onclin was born in Liège, Belgium, where he began playing tennis at local clubs. He continues to train in Belgium, maintaining strong ties to his hometown while competing internationally.
