2018 Croatia Open Umag – Singles

Andrey Rublev was the defending champion, but lost in the quarterfinals to Robin Haase. This was Rublev's first tournament back on tour after missing three months due to a stress fracture in his back.^[1]

Singles
2018 Croatia Open Umag
Champion	Marco Cecchinato
Runner-up	Guido Pella
Score	6–2, 7–6(7–4)
Draw	28 (4 Q / 3 WC )
Seeds	8

Main article: 2018 Croatia Open Umag

Marco Cecchinato won the title, defeating Guido Pella in the final, 6–2, 7–6^(7–4).

Seeds

The top four seeds receive a bye into the second round.

1. Kyle Edmund (withdrew due to a throat infection)
2. Damir Džumhur (second round)
3. Marco Cecchinato (champion)
4. Andrey Rublev (quarterfinals)
5. Albert Ramos Viñolas (second round)
6. Robin Haase (semifinals)
7. João Sousa (first round)
8. Benoît Paire (first round)
9. Maximilian Marterer (second round)

Draw

Key

• Q = Qualifier
• WC = Wild card
• LL = Lucky loser
• Alt = Alternate
• ITF = ITF entry
• PR = Protected ranking
• SR = Special ranking
• SE = Special exempt
• JE = Junior exempt
• JR = Junior Accelerator Programme entrant
• CO = College Accelerator Programme entrant
• NG = Next Gen Accelerator Program entrant
• w/o = Walkover
• r = Retired
• d = Defaulted

Finals

	Semifinals							Final
		Guido Pella	6	1	6
	6	Robin Haase	3	6	2
									Guido Pella	2	64
								3	Marco Cecchinato	6	77
	3	Marco Cecchinato	6	6
	Q	Marco Trungelliti	2	1

Top half

	First round							Second round							Quarterfinals							Semifinals
								5	A Ramos Viñolas	3	6	0
		D Lajović	7	6					D Lajović	6	1	6
		N Basilashvili	5	2												D Lajović	63	5
		G Pella	1	6	6											G Pella	77	7
		T Daniel	6	3	3				G Pella	5	6	6
		A Bedene	77	4	6				A Bedene	7	4	4
	7	J Sousa	65	6	4																		G Pella	6	1	6
																						6	R Haase	3	6	2
								4	A Rublev	6	64	6
	WC	F Auger-Aliassime	6	6				WC	F Auger-Aliassime	4	77	3
	LL	A Martin	4	3											4	A Rublev	3	66
	Q	M Kližan	6	6											6	R Haase	6	78
		N Jarry	2	0				Q	M Kližan	6	4	3
	Q	R Dutra Silva	6	5	3			6	R Haase	3	6	6
	6	R Haase	4	7	6

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	9	M Marterer	3	7	6
	WC	N Serdarušić	6	5	3			9	M Marterer	64	3
		L Đere	6	1	6				L Đere	77	6
		P Cuevas	4	6	3											L Đere	4	1
	Q	S Travaglia	3	6	2										3	M Cecchinato	6	6
		J Veselý	6	3	6				J Veselý	6	5	5
								3	M Cecchinato	2	7	7
																						3	M Cecchinato	6	6
	8	B Paire	1	3																		Q	M Trungelliti	2	1
		M Fucsovics	6	6					M Fucsovics	7	4	2
	Q	M Trungelliti	6	6				Q	M Trungelliti	5	6	6
	WC	F Škugor	3	4											Q	M Trungelliti	6	6
		P Lorenzi	3	4												E Donskoy	1	4
		E Donskoy	6	6					E Donskoy	711	3	6
								2	D Džumhur	69	6	4

Qualifying

Seeds

1. Martin Kližan (qualified)
2. Rogério Dutra Silva (qualified)
3. Alexey Vatutin (qualifying competition, retired)
4. Stefano Travaglia (qualified)
5. Facundo Bagnis (first round)
6. Enrique López Pérez (first round, retired)
7. Andrej Martin (qualifying competition, lucky loser)
8. Kenny de Schepper (qualifying competition)

Qualifiers

1. Martin Kližan
2. Rogério Dutra Silva
3. Marco Trungelliti
4. Stefano Travaglia

Lucky loser

1. Andrej Martin

Qualifying draw

First qualifier

	First round							Qualifying competition
	1	Martin Kližan	2	77	6
		Danilo Petrović	6	62	4
								1	Martin Kližan	6	6
								8	Kenny de Schepper	4	2
		Zsombor Piros	2	65
	8	Kenny de Schepper	6	77

Second qualifier

	First round							Qualifying competition
	2	Rogério Dutra Silva	6	6
	WC	Admir Kalender	3	2
								2	Rogério Dutra Silva	6	5	6
								7	Andrej Martin	2	7	2
		Roberto Quiroz	2	60
	7	Andrej Martin	6	77

Third qualifier

	First round							Qualifying competition
	3	Alexey Vatutin	6	6
	Alt	Nik Razboršek	2	3
								3	Alexey Vatutin	2r
									Marco Trungelliti	3
		Marco Trungelliti	77	6
	5	Facundo Bagnis	64	3

Fourth qualifier

	First round							Qualifying competition
	4	Stefano Travaglia	77	77
		Gian Marco Moroni	63	61
								4	Stefano Travaglia	1	6	6
									Peđa Krstin	6	3	2
		Peđa Krstin	3
	6	Enrique López Pérez	1r