Singles
2018 International Challenger Zhangjiagang
Champion	Yasutaka Uchiyama
Runner-up	Jason Jung
Score	6–2, 6–2

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.

Seeds

Draw

Finals

	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

Top half

	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

Bottom half

	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

References

• Main Draw
• Qualifying Draw