2025 International Challenger Zhangjiagang

2025 International Challenger Zhangjiagang
Date	25 August – 1 September
Edition	6th
Surface	Hard
Location	Zhangjiagang, China
Champions
Singles
Sho Shimabukuro
Doubles
Luca Castelnuovo / Akira Santillan

The 2025 International Challenger Zhangjiagang was a professional tennis tournament played on hard courts. It was the sixth edition of the tournament which was part of the 2025 ATP Challenger Tour. It took place in Zhangjiagang, China between 25 August and 1 September 2025.

Country	Player	Rank1	Seed
AUS	Bernard Tomic	169	1
JPN	Rio Noguchi	196	2
JPN	Sho Shimabukuro	201	3
CHN	Sun Fajing	215	4
JPN	Yasutaka Uchiyama	227	5
GBR	Oliver Crawford	232	6
	Ilia Simakin	238	7
FRA	Arthur Géa	257	8

• ¹ Rankings are as of 18 August 2025.^[1]

The following players received wildcards into the singles main draw:

• Mo Yecong
• Te Rigele
• Xiao Linang

The following player received entry into the singles main draw using a protected ranking:

• Philip Sekulic

The following players received entry into the singles main draw as alternates:

• Luca Castelnuovo
• Sergey Fomin
• Renta Tokuda

The following players received entry from the qualifying draw:

• Joshua Charlton
• Huang Tsung-hao
• Yuta Kikuchi
• Filip Peliwo
• Kaichi Uchida
• Kaito Uesugi

The following player received entry as a lucky loser:

• James Watt

• Sho Shimabukuro def. Oliver Crawford 6–3, 3–6, 7–5.

• Luca Castelnuovo / Akira Santillan def. Petr Bar Biryukov / Alexandr Binda 6–3, 6–7^(8–10), [10–3].