Singles
2018 International Challenger Zhangjiagang
Final
Champion	Yasutaka Uchiyama
Runner-up	Jason Jung
Score	6–2, 6–2
Events
Singles Doubles
← 2017 · International Challenger Zhangjiagang · 2019 →

Jason Jung was the defending champion but lost in the final to Yasutaka Uchiyama.

Uchiyama won the title after defeating Jung 6–2, 6–2 in the final.

	Semifinals							Final
	1	Jason Jung	77	65	6
	8	Alexander Bublik	63	77	0
								1	Jason Jung	2	2
									Yasutaka Uchiyama	6	6
		Yasutaka Uchiyama	6	4	7
	6	Miomir Kecmanović	3	6	5

	First round							Second round							Quarterfinals							Semifinals
	1	J Jung	6	6
	Q	Y Shimizu	4	3				1	J Jung	6	6
		Z Li	0	6	3			WC	Zh Zhang	4	4
	WC	Zh Zhang	6	1	6										1	J Jung	7	6
		T-h Yang	4	1r												A Santillan	5	2
		A Santillan	6	3					A Santillan	7	64	6
	WC	R Te	6	6				WC	R Te	5	77	4
	5	F Peliwo	4	4																		1	J Jung	77	65	6
	4	G Soeda	7	7																		8	A Bublik	63	77	0
		A Bega	5	5				4	G Soeda	5	6	2
		Y-s Chung	3	6	6				Y-s Chung	7	3	6
		R Safiullin	6	4	3											Y-s Chung	4	4
	Q	D Kelly	77	7											8	A Bublik	6	6
		S-w Kwon	65	5				Q	D Kelly	5	4
	LL	Y Takahashi	3	4				8	A Bublik	7	6
	8	A Bublik	6	6

	First round							Second round							Quarterfinals							Semifinals
	7	H Moriya	78	6
	Q	T Lamasine	66	2				7	H Moriya	6	65	3
		Y Uchiyama	6	4					Y Uchiyama	4	77	6
		B Kavčič	3	2r												Y Uchiyama	6	6
		U Ignatik	6	77												U Ignatik	4	3
		A Šetkić	2	63					U Ignatik	78	6
		D-h Lee	6	5	6				D-h Lee	66	1
	3	Ze Zhang	3	7	0																		Y Uchiyama	6	4	7
	6	M Kecmanović	6	3	6																	6	M Kecmanović	3	6	5
		M Purcell	3	6	3			6	M Kecmanović	2	6	6
	Q	F Ferreira Silva	4	4					J Rodionov	6	3	3
		J Rodionov	6	6											6	M Kecmanović	6	6
	WC	Y Wu	6	6											WC	Y Wu	4	4
	WC	Y He	3	4				WC	Y Wu	78	4	6
		S Diez	4	1				2	T Ito	66	6	3
	2	T Ito	6	6

• Main Draw
• Qualifying Draw