Challenger de Skopie | 05/20 12:30 | 25 | [351] Kamil Majchrzak v Gauthier Onclin [259] | 6-2,6-3 | |
Challenger de Oeiras | 05/14 14:20 | 25 | [282] Gauthier Onclin v Beibit Zhukayev [174] | 6-7,6-7 | |
Challenger de Praga | 05/12 11:00 | 29 | [295] Jiri Vesely v Gauthier Onclin [282] | 6-2,3-6,7-6 | |
Challenger de Praga | 05/11 09:00 | 28 | [210] Alex Molcan v Gauthier Onclin [282] | Retired | |
Challenger de Praga | 05/10 11:00 | 27 | [282] Gauthier Onclin v Javier Barranco Cosano [259] | 6-3,2-6,7-5 | |
Challenger de Praga | 05/09 09:00 | 26 | [212] Oriol Roca Batalla v Gauthier Onclin [282] | 6-7,7-6,2-6 | |
Challenger de Praga | 05/06 11:35 | 25 | [241] Gijs Brouwer v Gauthier Onclin [282] | 2-6,2-6 | |
Challenger de Ostrava | 04/24 08:00 | 26 | [205] Dennis Novak v Gauthier Onclin [276] | 7-6,6-2 | |
Challenger de Ostrava | 04/23 09:45 | 25 | [265] Dimitar Kuzmanov v Gauthier Onclin [276] | 5-7,6-7 | |
Challenger de Oeiras | 04/16 11:45 | 25 | [158] Jesper De Jong v Gauthier Onclin [269] | 6-3,6-2 | |
Challenger de Oeiras | 04/15 09:30 | 19 | [245] Maks Kasnikowski v Gauthier Onclin [269] | 6-7,3-6 | |
Challenger de Oeiras | 04/14 11:50 | 14 | [451] Miguel Damas v Gauthier Onclin [268] | 4-6,1-6 |
Gauthier Onclin (born 26 February 2001) is a Belgian tennis player. He has a career high ranking of 184 achieved on September 18, 2023.
In January 2023 Onclin reached the semifinals of the 2023 BW Open in Mons 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.