2023 Halle Open

The 2023 Halle Open (known for sponsorship reasons as the Terra Wortmann Open) was a men's tennis tournament played on outdoor grass courts. It was the 30th edition of the Halle Open and part of the ATP Tour 500 series of the 2023 ATP Tour. It took place at the OWL Arena in Halle, Germany, between 19 June and 25 June 2023. Unseeded Alexander Bublik won the singles title.

Singles

 * 🇰🇿 Alexander Bublik def. Andrey Rublev, 6–3, 3–6, 6–3

Doubles

 * 🇧🇷 Marcelo Melo / 🇦🇺 John Peers def. 🇮🇹 Simone Bolelli / 🇮🇹 Andrea Vavassori, 7–6(7–3), 3–6, [10–6]

Prize money

 * per team

Seeds

 * 1 Rankings are as of 12 June 2023.

Other entrants
The following players received wildcards into the main draw:
 * 🇩🇪 Yannick Hanfmann
 * 🇩🇪 Oscar Otte
 * 🇦🇹 Dominic Thiem
 * Stefanos Tsitsipas

The following player received entry using a protected ranking:
 * Lloyd Harris

The following players received entry from the qualifying draw:
 * 🇺🇸 Christopher Eubanks
 * 🇺🇸 Marcos Giron
 * Roman Safiullin
 * 🇩🇪 Louis Wessels

The following player received entry as lucky losers:
 * 🇮🇹 Andrea Vavassori
 * Aslan Karatsev

Withdrawals

 * 🇨🇦 Félix Auger-Aliassime → replaced by 🇮🇹 Andrea Vavassori
 * 🇪🇸 Pablo Carreño Busta → replaced by 🇷🇸 Laslo Djere
 * Karen Khachanov → replaced by 🇪🇸 Roberto Carballés Baena
 * 🇦🇺 Nick Kyrgios → replaced by Aslan Karatsev
 * 🇳🇴 Casper Ruud → replaced by 🇨🇳 Wu Yibing

Seeds

 * 1 Rankings are as of 12 June 2023.

Other entrants
The following pairs received wildcards into the doubles main draw:
 * 🇧🇷 Marcelo Demoliner / 🇩🇪 Andreas Mies
 * 🇩🇪 Oscar Otte / 🇩🇪 Jan-Lennard Struff

The following pair received entry from the qualifying draw:
 * 🇫🇷 Albano Olivetti / 🇪🇸 David Vega Hernández

Withdrawals

 * 🇦🇷 Máximo González / 🇦🇷 Andrés Molteni → replaced by 🇮🇹 Simone Bolelli / 🇮🇹 Andrea Vavassori
 * Karen Khachanov / Andrey Rublev → replaced by  Andrey Rublev / 🇩🇪 Alexander Zverev