Guy den Ouden
Guy den Ouden is a Dutch professional tennis player. He has a career-high singles ranking of world No. 147, achieved on 8 September 2025. He is currently the No. 4 player from the Netherlands.
In 2020 and 2021, den Ouden attended Pepperdine University in California.
Early life
Guy den Ouden was born in Maarssen, in the middle of the Netherlands, in the province of Utrecht. He is the son of Arnoud and Anne Den Ouden, who were both keen tennis players. He played football at VV Maarssen before concentrating on tennis. He trained at the National Tennis Center with senior pros such as Botic van de Zandschulp, Robin Haase and Jesper de Jong and became Dutch champion at U16 and U18 level.Career
2020-2022: Juniors, Pro Tour debuts
As a junior, he reached the semifinals at the 2020 French Open – Boys' singles. He was the first Dutch person to have achieved this since Thiemo de Bakker in 2006. His run included a win over the second seed and 2020 Australian Open - Boys' singles finalist Arthur Cazaux.In 2022, den Ouden won five ITF tournaments and his ranking climbed inside the top 500 for the first time, before being sidelined by injury. Upon his return he was chosen as a training partner for the Dutch Davis Cup team.
2023-2025: Maiden Challenger title, top 150
In June 2023, den Ouden won an ITF tournament in Aarhus, Denmark. The following month he was a finalist at a tournament in The Hague, Netherlands. In November 2023, den Ouden defeated Arthur Géa to win an ITF Futures hardcourt tournament in Heraklion.In February 2024, he was given a wildcard into qualifying for the 2024 ABN AMRO Open in Rotterdam where he lost to alternate Pablo Llamas Ruiz.
In September 2024, den Ouden won his maiden title at the 2024 Izida Cup II in Dobrich, Bulgaria, where he faced compatriot Jelle Sels, defeating him in straight sets. As a result he made his top 300 debut on 16 September 2024.
Following his second final at the 2025 Rwanda Challenger II, a semifinal and a final at the ITF tournaments in Santa Margherita di Pula, den Ouden reached the top 250 in the rankings on 21 April 2025. Following another Challenger final at the 2025 Advantage Cars Prague Open, den Ouden reached the top 200 at No. 187 on 19 May 2025. He won his second title on the Challenger Tour in Porto in September 2025 and moved into the top 150 of the world rankings for the first time.
ATP Challenger Tour finals
Singles: 6 (2 titles, 4 runner-ups)
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Win | 1–0 | [2024 Dobrich Challenger II – Singles|] | Izida Cup II, Bulgaria | Challenger | Clay |  dts|Mar 2025 |