2018 Slovak Open

Country	Player	Rank1	Seed
SVK	Lukáš Lacko	82	1
RUS	Evgeny Donskoy	100	2
ITA	Lorenzo Sonego	105	3
ESP	Guillermo García López	106	4
ARG	Marco Trungelliti	118	5
IND	Ramkumar Ramanathan	121	6
CYP	Marcos Baghdatis	127	7
BEL	Ruben Bemelmans	129	8

• ¹ Rankings are as of 29 October 2018.^[1]

The following players received wildcards into the singles main draw:

• Norbert Gombos
• Lukáš Klein
• Tomáš Líška
• Alex Molčan

The following player received entry into the singles main draw using a protected ranking:

• Egor Gerasimov

The following players received entry into the singles main draw as alternates:

• Filip Horanský
• Uladzimir Ignatik

The following players received entry from the qualifying draw:

• Alexander Bublik
• Johannes Härteis
• Daniel Masur
• Jurij Rodionov

• Alexander Bublik def. Lukáš Rosol 6–4, 6–4.

• Denys Molchanov / Igor Zelenay def. Ramkumar Ramanathan / Andrei Vasilevski 6–2, 3–6, [11–9].