| ITF M25 Sintra | 10/09 14:30 | 25 |
Sergey Fomin
v
Gauthier Onclin 
|
2-6,5-7 | |
| Challenger Bonn | 08/05 13:00 | 25 |
Hady Habib
v
Gauthier Onclin
|
Cancelled | |
| Challenger Luedenscheid | 07/31 09:00 | 26 |
[268] Gauthier Onclin v
Oriol Roca Batalla
[159] 
|
6-7,7-5,4-6 | |
| Challenger Luedenscheid | 07/29 15:00 | 25 |
[239] Bernabe Zapata Miralles
v
Gauthier Onclin [268]
|
1-6,5-7 | |
| Challenger Tampere | 07/25 14:10 | 26 |
[234] Aziz Dougaz
v
Gauthier Onclin [286]
|
7-5,6-3 | |
| Challenger Tampere | 07/23 09:00 | 25 |
Henri Laaksonen
v
Gauthier Onclin
|
3-6,4-6 | |
| ITF M25 Esch/Alzette | 07/21 12:55 | 29 |
Gauthier Onclin v
Chris Rodesch
|
1-6,6-3,4-6 | |
| ITF M25 Esch/Alzette | 07/20 12:50 | 28 |
[275] Gauthier Onclin v
Alejo Lorenzo Lingua Lavallen
[402] |
7-6,7-6 | |
| ITF M25 Esch/Alzette | 07/19 12:10 | 27 |
Gauthier Onclin v
Simon Beaupain
|
6-4,6-4 | |
| ITF M25 Esch/Alzette | 07/18 13:10 | 26 |
Gauthier Onclin v
Aaron Gil Garcia
|
6-2,6-2 | |
| ITF M25 Esch/Alzette | 07/17 12:00 | 25 |
Gauthier Onclin v
Nicholas Campbell
|
6-0,6-1 | |
| ITF M25 Kassel | 07/13 12:30 | 28 |
[309] Khumoyun Sultanov
v
Gauthier Onclin [259]
|
4-6,6-3,6-4 | |
| ITF M25 Kassel | 07/12 12:55 | 27 |
Daniel Siniakov
v
Gauthier Onclin
|
4-6,6-3,4-6 | |
| ITF M25 Kassel | 07/11 09:30 | 26 |
Valentin Basel
v
Gauthier Onclin
|
3-6,4-6 | |
| ITF M25 Kassel | 07/09 12:30 | 25 |
Leopold Zima
v
Gauthier Onclin
|
1-6,3-6 | |
| Challenger Milan | 06/26 11:25 | 25 |
[349] Ivan Gakhov
v
Gauthier Onclin [257]
|
6-2,6-2 | |
| ITF M25 Duffel | 06/22 10:00 | 28 |
[260] Gauthier Onclin v
Sandro Kopp
[339] |
4-6,3-6 | |
| ITF M25 Duffel | 06/21 13:00 | 27 |
[260] Gauthier Onclin v
Max Houkes
[411] |
6-7,6-4,7-6 | |
| ITF M25 Duffel | 06/20 08:00 | 26 |
Gauthier Onclin v
Niels Ratiu
|
Retired | |
| ITF M25 Duffel | 06/19 13:25 | 25 |
Gauthier Onclin v
Steffan Van Weldam
|
6-0,6-0 | |
| Challenger Lyon | 06/10 12:30 | 25 |
[263] Gauthier Onclin v
Clement Tabur
[236] |
2-6,6-7 | |
| Challenger Prostejov | 06/03 14:40 | 25 |
[261] Gauthier Onclin v
Kyrian Jacquet
[232] |
0-6,4-6 | |
| Challenger Skopje | 05/20 12:30 | 25 |
[351] Kamil Majchrzak
v
Gauthier Onclin [259]
|
6-2,6-3 | |
| Challenger Oeiras | 05/14 14:20 | 25 |
[282] Gauthier Onclin v
Beibit Zhukayev
[174] 
|
6-7,6-7 | |
| Challenger Prague | 05/12 11:00 | 29 |
[295] Jiri Vesely
v
Gauthier Onclin [282]
|
6-2,3-6,7-6 | |
| Challenger Prague | 05/11 09:00 | 28 |
[210] Alex Molcan
v
Gauthier Onclin [282]
|
Retired | |
| Challenger Prague | 05/10 11:00 | 27 |
[282] Gauthier Onclin v
Javier Barranco Cosano
[259] 
|
6-3,2-6,7-5 | |
| Challenger Prague | 05/09 09:00 | 26 |
[212] Oriol Roca Batalla
v
Gauthier Onclin [282]
|
6-7,7-6,2-6 | |
| Challenger Prague | 05/06 11:35 | 25 |
[241] Gijs Brouwer
v
Gauthier Onclin [282]
|
2-6,2-6 | |
| Challenger Ostrava | 04/24 08:00 | 26 |
[205] Dennis Novak
v
Gauthier Onclin [276]
|
7-6,6-2 |
Wikipedia - Gauthier Onclin
Gauthier Onclin (born 26 February 2001) is a Belgian tennis player who plays mainly on the ATP Challenger Tour. He has a career high ranking of world No. 194 achieved on 18 September 2023.
History
2023: ATP debut in doubles
In January, Onclin reached the semifinals of the 2023 BW Open in Ottignies-Louvain-la-Neuve where he lost to eventual champion and compatriot David Goffin.
In May, he defeated the higher-ranked Elias Ymer at a Challenger event in Bordeaux in the first round. At the 2023 French Open he defeated Nicholas David Ionel in straight sets in the first round of qualifying before losing to Argentine Thiago Agustin Tirante in three sets. Onclin got his revenge over the Argentine in the qualifying at the 2023 Wimbledon Championships, winning in straight sets during his first ever grass-court summer, as his junior years coincided with the grass-court portion of the Tour cancellation due to the COVID-19 pandemic.
In October, he received a wildcard in doubles for the European Open in Antwerp, alongside compatriot Michael Geerts. At the same tournament, in the qualifying singles competition, he defeated higher-ranked American Maxime Cressy.
2024: Maiden Challenger final
In May, Onclin reached his first Challenger final at the Prague Open. He lost to the former world No. 35 Jiří Veselý.