Thomas Fabbiano Thomas Fabbiano (born 26 May 1989) is an Italian people, Italian former tennis player who played mostly on the ATP Challenger Tour. On 11 September 2017, he reached his then-highest Association of Tennis Professionals, ATP singles ranking of 70. ...

was the defending champion but chose not to defend his title.

Mackenzie McDonald Michael Mackenzie Lowe McDonald (born April 16, 1995) is an American professional tennis player. He has a career-high singles ATP rankings, ranking of world No. 37, achieved on October 16, 2023 and a doubles ranking of No. 49, achieved on Octobe ...

won the title after defeating Jordan Thompson 1–6, 6–4, 6–1 in the final.

Seeds

Draw

Finals

Top half

Bottom half

References

Main DrawQualifying Draw
{{DEFAULTSORT:2018 Seoul Open Challenger - Singles Seoul Open Challenger - Singles

2018 Singles Eighteen or 18 may refer to: * 18 (number) * One of the years 18 BC, AD 18, 1918, 2018 Film, television and entertainment * ''18'' (film), a 1993 Taiwanese experimental film based on the short story ''God's Dice'' * ''Eighteen'' (film), a 2 ...