2018 Oracle Challenger Series – Chicago – Men's Singles

Denis Istomin won the title after defeating Reilly Opelka 6–4, 6–2 in the final.

Chicago – Men's Singles
2018 Oracle Challenger Series – Chicago
Champion	Denis Istomin
Runner-up	Reilly Opelka
Final score	6–4, 6–2

Main article: 2018 Oracle Challenger Series – Chicago

This was the first edition of the tournament.

Seeds

1. Andreas Seppi (First round)
2. Denis Istomin (Champion)
3. Vasek Pospisil (First round)
4. Viktor Troicki (First round)
5. Michael Mmoh (Second round)
6. Ruben Bemelmans (Quarterfinals)
7. Elias Ymer (First round)
8. Noah Rubin (Quarterfinals)

Draw

Key

• Q = Qualifier
• WC = Wild Card
• LL = Lucky Loser
• Alt = Alternate
• SE = Special Exempt
• PR = Protected Ranking
• ITF = ITF entry
• JE = Junior Exempt
• w/o = Walkover
• r = Retired
• d = Defaulted

Finals

	Semifinals							Final
	Alt	Dominik Köpfer	3	6^3
		Reilly Opelka	6	7^7
									Reilly Opelka	4	2
								2	Denis Istomin	6	6
		Bjorn Fratangelo	1	2
	2	Denis Istomin	6	6

Top half

	First Round							Second Round							Quarterfinals							Semifinals
	1/WC	A Seppi	3	6^5
	Q	A Sarkissian	6	7^7				Q	A Sarkissian	6	6^4	6^3
		DE Galán	6^5	3					JC Aragone	2	7^7	7^7
		JC Aragone	7^7	6												JC Aragone	4	2
	Alt	D Köpfer	6	6											Alt	D Köpfer	6	6
	Q	V Millot	3	4				Alt	D Köpfer	4	7^7	6
		M Krueger	3	6	6				M Krueger	6	6^4	2
	7	E Ymer	6	3	2																	Alt	D Köpfer	3	6^3
	3	V Pospisil	2	2																			R Opelka	6	7^7
	Alt	D Young	6	6				Alt	D Young	6	6
		J-P Smith	2	6	6				J-P Smith	3	4
	Alt	R Cid Subervi	6	1	4										Alt	D Young	6	2	6^5
		R Quiroz	3	2												R Opelka	3	6	7^7
		R Opelka	6	6					R Opelka	6	6
		C Eubanks	7	4	4			5	M Mmoh	4	4
	5	M Mmoh	5	6	6

Bottom half

	First Round							Second Round							Quarterfinals							Semifinals
	8	N Rubin	6	3	6
		E King	4	6	3			8	N Rubin	5	6	7
		A Popyrin	6	7					A Popyrin	7	2	5
		V Estrella Burgos	3	5											8	N Rubin	1	4
	Alt	E Escobedo	6^3	6	1											B Fratangelo	6	6
	Q	S Bangoura	7^7	4	6			Q	S Bangoura	4	6	5
		B Fratangelo	2	6	6				B Fratangelo	6	1	7
	4	V Troicki	6	2	0																		B Fratangelo	1	2
	6	R Bemelmans	7	7^8																		2	D Istomin	6	6
	Q	H Nys	5	6^6				6	R Bemelmans	6	6
	LL	K Uchida	6	6				LL	K Uchida	3	4
	WC	T-S Kwiatkowski	1	3											6	R Bemelmans	3	4
	WC	T Paul	6	6											2	D Istomin	6	6
	LL	R Roelofse	3	2				WC	T Paul	5	3
		M Arévalo	4	1				2	D Istomin	7	6
	2	D Istomin	6	6

References

• Main Draw
• Qualifying Draw