The 2025 Nonthaburi Challenger III was a professional tennis tournament played on hard courts. It was the 13th edition of the tournament which was part of the 2025 ATP Challenger Tour. It took place in Nonthaburi, Thailand from 13 to 19 January 2025.
Singles main-draw entrants Seeds Country Player Rank1 SeedVít Kopřiva1251Hugo Grenier1542Valentin Vacherot1623Zachary Svajda1654Shintaro Mochizuki1705Coleman Wong1726Henri Squire1787Dmitry Popko1838 1 Rankings are as of 6 January 2025.
Other entrants The following players received wildcards into the singles main draw: Thanapet Chanta Maximus Jones Wishaya Trongcharoenchaikul
The following players received entry into the singles main draw as alternates: Federico Arnaboldi Shintaro Mochizuki Wu Tung-lin
The following players received entry from the qualifying draw: Rémy Bertola Murphy Cassone Francesco Maestrelli Rio Noguchi Sun Fajing Clément Tabur
Champions Singles
Brandon Holt def. Vít Kopřiva 6–3, 6–2.
Doubles
Ray Ho / Neil Oberleitner def. Pruchya Isaro / Wang Aoran 6–3, 6–4.
References