2018 Diema Xtra Sofia Open – Singles
was the defending champion, but withdrew before the tournament because of a shoulder injury.
Mirza Bašić won his first ATP title, defeating Marius Copil in the final, 7–6, 6–7, 6–4.Seeds
The top four seeds receive a bye into the second round.Draw
Finals
Seeds
Qualifiers
Qualifying draw
Second qualifier
Third qualifier
