| 2025 Zug Open | |
|---|---|
| Date | 21 – 27 July |
| Edition | 4th |
| Surface | Clay |
| Location | Zug, Switzerland |
| Champions | |
| Singles | |
 Lukáš Klein | |
| Doubles | |
| no champions | |
The 2025 Dialectic Zug Open was a professional tennis tournament played on outdoor clay courts. It was the fourth edition of the tournament and part of the 2025 ATP Challenger Tour. It took place in Zug, Switzerland between 21 and 27 July 2025.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 HUN | Zsombor Piros | 166 | 1 |
 SUI | Marc-Andrea Hüsler | 170 | 2 |
 FRA | Calvin Hemery | 171 | 3 |
| FRA | Harold Mayot | 178 | 4 |
 ITA | Francesco Maestrelli | 179 | 5 |
 ARG | Santiago Rodríguez Taverna | 188 | 6 |
| ARG | Facundo Díaz Acosta | 189 | 7 |
 LBN | Benjamin Hassan | 196 | 8 |
The following players received wildcards into the singles main draw:
The following player received entry into the singles main draw as a special exempt:
The following players received entry into the singles main draw as alternates:
The following players received entry from the qualifying draw:
Lukáš Klein def. Harold Mayot 6–2, 6–7(4–7), 6–4. Geoffrey Blancaneaux / Harold Mayot vs. 
Nam Ji-sung / 
Takeru Yuzuki , not completed.
