2023 Ostra Group Open
The 2023 Ostra Group Open was a professional tennis tournament played on clay courts. It was the 20th edition of the tournament which was part of the 2023 ATP Challenger Tour. It took place in Ostrava, Czech Republic between 24 and 30 April 2023.
Singles main-draw entrants
Seeds
1 Rankings are as of 17 April 2023.Other entrants
The following players received wildcards into the singles main draw:The following players received entry into the singles main draw as alternates:
The following players received entry from the qualifying draw: