Gilles-Arnaud Bailly

Gilles-Arnaud Bailly is a Belgian professional tennis player. He has a career-high ATP singles ranking of No. 201, achieved on 10 November 2025 and a doubles ranking of No. 1,723 reached on 27 February 2023.

Junior career

Bailly had notable results on ITF junior circuit, maintaining a 97–40 singles win-loss record. He was a runner-up at the 2022 French Open and the 2022 US Open in the boys' singles category. As a result, he reached an ITF junior combined ranking of world No. 1 on 28 November 2022. Besides that, he became the first boy from Belgium to be crowned a world junior champion by the ITF.

Professional career

2022: ATP Tour debut

Bailly made his debut at the 2022 European Open where he received a main draw wildcard but lost in the first round to compatriot David Goffin despite playing for more than three hours and winning the second set.

2023-2025: First Challenger final and ATP win, top 205

Bailly received another invitation at European Open, for the qualies.
The following year, he qualified to the main draw of his home tournament but lost to German Daniel Altmaier.
Ranked No. 247, Bailly qualified again for his home event, that edition hosted in Brussels, and recorded his first ATP Tour win, over the same player, Altmaier, who defeated him the previous year. He lost to third seed Jiří Lehečka in the second round. As a result, he moved into the top 235 in the singles rankings and entered the qualification zone of the NextGen Finals. He eventually made it as a first alternate, having been ranked 11th in the race, following the withdrawal of the two top players.
Bailly finished that year at No. 204 in singles, having reached a career-high of world No. 201 the week before. It was the third-largest rankings climb for the 2025 season - behind Rafael Jódar and Petr Brunclík - raising close to 600 positions.