The 2023 Split Open was a professional tennis tournament played on clay courts. It was part of the 2023 ATP Challenger Tour. It took place in Split, Croatia between 10 and 16 April 2023.
The following players received wildcards into the singles main draw:
The following player received entry into the singles main draw as a special exempt:
The following player received entry into the singles main draw using a protected ranking:
The following player received entry into the singles main draw as an alternate:
The following players received entry from the qualifying draw: