2023 Koblenz Open

The 2023 Koblenz Open was a professional tennis tournament played on indoor hard courts. It was the fifth edition of the tournament which was part of the 2023 ATP Challenger Tour. It took place in Koblenz, Germany from 30 January to 5 February 2023.

Seeds

 * 1 Rankings are as of 16 January 2023.

Other entrants
The following players received wildcards into the singles main draw:
 * 🇩🇪 Max Hans Rehberg
 * 🇩🇪 Henri Squire
 * 🇩🇪 Marko Topo

The following players received entry into the singles main draw as alternates:
 * 🇧🇪 Raphaël Collignon
 * 🇩🇪 Lucas Gerch
 * Robin Haase
 * 🇩🇪 Daniel Masur
 * 🇩🇪 Louis Wessels

The following players received entry from the qualifying draw:
 * 🇩🇪 Johannes Härteis
 * 🇫🇷 Antoine Hoang
 * 🇩🇪 Mats Rosenkranz
 * 🇺🇦 Vitaliy Sachko
 * Alexey Vatutin
 * 🇰🇿 Denis Yevseyev

Singles

 * Roman Safiullin def. 🇨🇦 Vasek Pospisil 6–2, 7–5.

Doubles

 * 🇩🇪 Fabian Fallert / 🇩🇪 Hendrik Jebens def. 🇫🇷 Jonathan Eysseric / 🇺🇦 Denys Molchanov 7–6(7–2), 6–3.