2023 Heilbronner Neckarcup

The 2023 Heilbronner Neckarcup was a professional tennis tournament played on clay courts. It was the ninth edition of the tournament which was part of the 2023 ATP Challenger Tour. It took place in Heilbronn, Germany between 5 and 11 June 2023.

Singles

 * 🇮🇹 Matteo Arnaldi def. 🇦🇷 Facundo Díaz Acosta 7–6(7–4), 6–1.

Doubles

 * 🇩🇪 Constantin Frantzen / 🇩🇪 Hendrik Jebens def. 🇷🇴 Victor Vlad Cornea / 🇦🇹 Philipp Oswald 7–6(9–7), 6–4.

Seeds

 * 1 Rankings are as of 29 May 2023.

Other entrants
The following players received wildcards into the singles main draw:
 * 🇩🇪 Rudolf Molleker
 * 🇦🇹 Dominic Thiem
 * 🇩🇪 Marko Topo

The following players received entry into the singles main draw as alternates:
 * 🇫🇷 Dan Added
 * 🇦🇷 Hernán Casanova
 * 🇹🇷 Cem İlkel

The following players received entry from the qualifying draw:
 * 🇩🇪 Sebastian Fanselow
 * 🇩🇪 Lucas Gerch
 * Jérôme Kym
 * 🇩🇪 Max Hans Rehberg
 * 🇦🇺 Akira Santillan
 * 🇩🇪 Henri Squire

The following player received entry as a lucky loser:
 * 🇫🇷 Maxime Janvier