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was the defending champion, but lost in the second round to

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won his first

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title, defeating

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in the final, 7–6^(11–9), 6–4.

Seeds

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

Draw

Finals

Top half

Bottom half

Qualifying

Seeds

Qualifiers

Lucky losers

Qualifying draw

First qualifier

Second qualifier

Third qualifier

Fourth qualifier

References

Main draw

Qualifying draw
{{DEFAULTSORT:Swiss Open Gstaad - Singles, 2018 2018 ATP World Tour

2018 Singles Eighteen or 18 may refer to: * 18 (number), the natural number following 17 and preceding 19 * 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 ...