2025 International Challenger Zhangjiagang – Doubles

Doubles
2025 International Challenger Zhangjiagang
Champions	Luca Castelnuovo Akira Santillan
Runners-up	Petr Bar Biryukov Alexandr Binda
Score	6–3, 6–7(8–10), [10–3]

Kaichi Uchida and Takeru Yuzuki were the defending champions^[1] but chose to defend their title with different partners. Uchida partnered Yusuke Kusuhara but lost in the quarterfinals to Luca Castelnuovo and Akira Santillan. Yuzuki partnered Nam Ji-sung but lost in the semifinals to Castelnuovo and Santillan.

Castelnuovo and Santillan won the title after defeating Petr Bar Biryukov and Alexandr Binda 6–3, 6–7^(8–10), [10–3] in the final.

Key

	First round							Quarterfinals							Semifinals							Final
	1	F Reynolds J Watt	64	6	[10]
		R Ramanathan F Sun	77	2	[8]			1	F Reynolds J Watt	63	3
	Alt	P Bar Biryukov A Binda	3	6	[10]			Alt	P Bar Biryukov A Binda	77	6
		K Uesugi S Watanabe	6	4	[5]										Alt	P Bar Biryukov A Binda	3	6	[10]
	3	P Isaro N Kaliyanda Poonacha	5	6	[10]										3	P Isaro N Kaliyanda Poonacha	6	3	[4]
	WC	Sun Qian S Tang	7	3	[8]			3	P Isaro N Kaliyanda Poonacha	7	67	[10]
		M Imamura R Noguchi	7	77					M Imamura R Noguchi	5	79	[5]
		S Nakagawa N Tajima	5	63																		Alt	P Bar Biryukov A Binda	3	710	[3]
	Alt	L Castelnuovo A Santillan	6	77																		Alt	L Castelnuovo A Santillan	6	68	[10]
		I Simakin D Yevseyev	3	65				Alt	L Castelnuovo A Santillan	77	6
		Y Kusuhara K Uchida	79	2	[10]				Y Kusuhara K Uchida	65	0
	4	J Charlton D Stevenson	67	6	[7]										Alt	L Castelnuovo A Santillan	1	7	[12]
		J Cui R Te	6	6											2	J-s Nam T Yuzuki	6	5	[10]
	WC	Charles Chen Xiao Linang	3	4					J Cui R Te	4	7	[7]
		K Isomura A Wang	5	1				2	J-s Nam T Yuzuki	6	5	[10]
	2	J-s Nam T Yuzuki	7	6

• Main draw