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 Praha | 05/12 11:00 | 29 | [295] Jiri Vesely v Gauthier Onclin [282] | 6-2,3-6,7-6 | |
Challenger Praha | 05/11 09:00 | 28 | [210] Alex Molcan v Gauthier Onclin [282] | Retired | |
Challenger Praha | 05/10 11:00 | 27 | [282] Gauthier Onclin v Javier Barranco Cosano [259] | 6-3,2-6,7-5 | |
Challenger Praha | 05/09 09:00 | 26 | [212] Oriol Roca Batalla v Gauthier Onclin [282] | 6-7,7-6,2-6 | |
Challenger Praha | 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 | |
Challenger Ostrava | 04/23 09:45 | 25 | [265] Dimitar Kuzmanov v Gauthier Onclin [276] | 5-7,6-7 | |
Challenger Oeiras | 04/16 11:45 | 25 | [158] Jesper De Jong v Gauthier Onclin [269] | 6-3,6-2 | |
Challenger Oeiras | 04/15 09:30 | 19 | [245] Maks Kasnikowski v Gauthier Onclin [269] | 6-7,3-6 | |
Challenger Oeiras | 04/14 11:50 | 14 | [451] Miguel Damas v Gauthier Onclin [268] | 4-6,1-6 | |
ITF M25 Saint Dizier | 03/31 13:00 | 29 | [262] Alibek Kachmazov v Gauthier Onclin [279] | 6-3,6-7,5-7 | |
ITF M25 Saint Dizier | 03/30 15:10 | 28 | Buvaysar Gadamauri v Gauthier Onclin | 4-6,1-6 | |
ITF M25 Saint Dizier | 03/29 14:00 | 27 | [423] Sascha Gueymard Wayenburg v Gauthier Onclin [279] | 6-3,3-6,2-6 | |
ITF M25 Saint Dizier | 03/28 16:35 | 26 | Boris Fassbender v Gauthier Onclin | 3-6,3-6 | |
ITF M25 Saint Dizier | 03/27 10:25 | 25 | Adan Freire Da Silva v Gauthier Onclin | 3-6,1-6 | |
ITF M25 Toulouse | 03/22 14:10 | 27 | [279] Gauthier Onclin v Raphael Collignon [436] | 4-6,5-7 | |
ITF M25 Toulouse | 03/21 15:40 | 26 | Gauthier Onclin v Alexey Vatutin | 6-3,4-6,6-2 | |
ITF M25 Toulouse | 03/20 15:30 | 25 | [279] Gauthier Onclin v Antoine Hoang [495] | 6-1,6-2 | |
ITF M25 Creteil | 03/15 10:55 | 27 | Alexey Vatutin v Gauthier Onclin | 6-3,6-1 | |
ITF M25 Creteil | 03/14 10:00 | 26 | [169] Neil Oberleitner v Gauthier Onclin [264] | 4-6,6-2,2-6 | |
ITF M25 Creteil | 03/12 18:05 | 25 | Adrien Gobat v Gauthier Onclin | 4-6,6-1,4-6 | |
Challenger New Delhi | 02/27 14:15 | 25 | [267] Gauthier Onclin v Adam Walton [145] | 4-6,0-6 | |
Challenger Pune | 02/19 13:00 | 25 | [235] Tung-Lin Wu v Gauthier Onclin [252] | 7-6,6-7,6-3 | |
Challenger Bengaluru | 02/15 06:30 | 26 | [153] Adam Walton v Gauthier Onclin [252] | 6-2,6-2 | |
Challenger Bengaluru | 02/12 10:30 | 25 | [277] Giovanni Fonio v Gauthier Onclin [252] | 4-6,6-1,6-7 | |
Challenger Ottignies | 01/25 15:30 | 26 | [250] Leandro Riedi v Gauthier Onclin [218] | 7-5,6-3 | |
Challenger Ottignies | 01/24 16:10 | 25 | [184] Denis Yevseyev v Gauthier Onclin [218] | 4-6,4-6 |
Gauthier Onclin (born 26 February 2001) is a Belgian tennis player. He has a career high ranking of 194 achieved on September 18, 2023.
In January 2023 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 2023 he beat the higher-ranked Elias Ymer at a Challenger event in Bordeaux. 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 cancellation due to the COVID-19 pandemic.
In October 2023, 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.
In May 2024 Onclin reaches his first final in a Challenger tournament at the Prague Open. He loses to the former world number 35 Jiří Veselý.