The 2025 China International Suzhou was a professional tennis tournament played on hardcourts. It was the fourth edition of the tournament which was part of the 2025 ATP Challenger Tour. It took place in Suzhou, China between 20 and 26 October 2025.
The following players received wildcards into the singles main draw:
The following player received entry into the singles main draw using a protected ranking:
The following player received entry into the singles main draw through the Junior Accelerator programme:
The following player received entry into the singles main draw as an alternate:
The following players received entry from the qualifying draw:
The following player received entry as a lucky loser: