2023 International Challenger Zhangjiagang

The 2023 International Challenger Zhangjiagang was a professional tennis tournament played on hard courts. It was the fourth edition of the tournament which was part of the 2023 ATP Challenger Tour. It took place in Zhangjiagang, China between 28 August and 3 September 2023.

Seeds

 * 1 Rankings are as of 21 August 2023.

Other entrants
The following players received wildcards into the singles main draw:
 * 🇨🇳 Li Hanwen
 * 🇨🇳 Sun Fajing
 * 🇨🇳 Te Rigele

The following players received entry into the singles main draw as alternates:
 * 🇺🇸 Alafia Ayeni
 * 🇳🇿 Rubin Statham

The following players received entry from the qualifying draw:
 * 🇨🇳 Bai Yan
 * 🇨🇳 Cui Jie
 * Mikalai Haliak
 * 🇨🇳 Liu Hanyi
 * 🇧🇬 Leonid Sheyngezikht
 * 🇨🇳 Xiao Linang

The following players received entry as lucky losers:
 * Colin Sinclair
 * 🇯🇵 Yusuke Takahashi

Singles

 * 🇫🇷 Térence Atmane def. Mikalai Haliak 6–1, 6–2.

Doubles

 * Ray Ho / 🇦🇺 Matthew Romios def. Francis Alcantara / 🇨🇳 Sun Fajing 6–3, 6–4.