2018 Tilia Slovenia Open – Singles

Sergiy Stakhovsky was the defending champion but lost in the quarterfinals to Constant Lestienne.

Lestienne won the title after defeating Andrea Arnaboldi 6–2, 6–1 in the final.

Seeds
• # 🇺🇦 Sergiy Stakhovsky (quarterfinals)

• # 🇦🇹 Dennis Novak (first round)

• # 🇪🇸 Adrián Menéndez Maceiras (semifinals)

• # 🇮🇹 Gianluigi Quinzi (first round)

• # 🇮🇹 Salvatore Caruso (quarterfinals)

• # 🇮🇹 Luca Vanni (second round)

• # Nino Serdarušić (second round)

• # 🇮🇹 Andrea Arnaboldi (final)