# 2023 Zug Open – Singles

Dominic Stricker was the defending champion but lost in the first round to Joris De Loore.
Arthur Rinderknech won the title after defeating De Loore 3–6, 6–3, 6–4 in the final.

## Seeds

* Arthur Rinderknech (champion)
* Dominic Stricker (first round)
* Jurij Rodionov (semifinals)
* Fabio Fognini (semifinals)
* Otto Virtanen (second round)
* Harold Mayot (second round)
* Alexander Ritschard (second round)
* Dimitar Kuzmanov (second round)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final | Final |
| 1 | Arthur Rinderknech | 4 | 7 | 6 | | | | | |
| 3 | Jurij Rodionov | 6 | 5 | 2 | | | | | |
| 3 | Jurij Rodionov | 6 | 5 | 2 | 1 | Arthur Rinderknech | 3 | 6 | 6 |
| | | | | | | Joris De Loore | 6 | 3 | 4 |
| 4 | Fabio Fognini | 6$^3$ | 1 | | | Joris De Loore | 6 | 3 | 4 |
| | Joris De Loore | 7$^7$ | 6 | | | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | A Rinderknech | 7$^7$ | 6 | | | | | | | | | | | | | | | |
| Q | G Ferrari | 6$^3$ | 3 | | 1 | A Rinderknech | 4 | 6 | 6 | | | | | | | | | |
| WC | M Brunold | 3 | 2 | | | S Travaglia | 6 | 4 | 3 | | | | | | | | | |
| | S Travaglia | 6 | 6 | | | | | | | 1 | A Rinderknech | 6 | 6 | | | | | |
| Alt | M Pucinelli de Almeida | 2 | 4 | | | | | | | | A Andreev | 2 | 2 | | | | | |
| | A Andreev | 6 | 6 | | | A Andreev | 7$^7$ | 1 | 6 | | | | | | | | | |
| | F Ferreira Silva | 6 | 4 | 2 | 6 | H Mayot | 6$^5$ | 6 | 4 | | | | | | | | | |
| 6 | H Mayot | 4 | 6 | 6 | | | | | | | | | | 1 | A Rinderknech | 4 | 7 | 6 |
| 3 | J Rodionov | 6 | 7 | | | | | | | | | | | 3 | J Rodionov | 6 | 5 | 2 |
| | H Medjedovic | 3 | 5 | | 3 | J Rodionov | 6 | 6 | | | | | | | | | | |
| Q | R Bertola | 2 | 3 | | | DN Mădăraș | 2 | 4 | | | | | | | | | | |
| | DN Mădăraș | 6 | 6 | | | | | | | 3 | J Rodionov | 6 | 7 | | | | | |
| | M Neuchrist | 4 | 4 | | | | | | | | Z Bergs | 3 | 5 | | | | | |
| | Z Bergs | 6 | 6 | | | Z Bergs | 2 | 7$^9$ | 6 | | | | | | | | | |
| Q | E Kırkın | 6$^3$ | 4 | | 5 | O Virtanen | 6 | 6$^7$ | 3 | | | | | | | | | |
| 5 | O Virtanen | 7$^7$ | 6 | | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 7 | A Ritschard | 6 | 6 | | | | | | | | | | | | | | | |
| Q | T Handel | 2 | 1 | | 7 | A Ritschard | 4 | 4 | | | | | | | | | | |
| | J Menšík | 6 | 6 | | | J Menšík | 6 | 6 | | | | | | | | | | |
| | S Rodríguez Taverna | 4 | 3 | | | | | | | | J Menšík | 4 | 2 | | | | | |
| Alt | A Dougaz | 6 | 6 | | | | | | | 4 | F Fognini | 6 | 6 | | | | | |
| | J Sels | 3 | 4 | | Alt | A Dougaz | 6 | 6$^5$ | 0 | | | | | | | | | |
| WC | K Feldbausch | 4 | 2 | | 4 | F Fognini | 1 | 7$^7$ | 6 | | | | | | | | | |
| 4 | F Fognini | 6 | 6 | | | | | | | | | | | | 4 | F Fognini | 6$^3$ | 1 |
| 8 | D Kuzmanov | 6 | 6 | | | | | | | | | | | | | J De Loore | 7$^7$ | 6 |
| Q | Dylan Dietrich | 2 | 1 | | 8 | D Kuzmanov | 4 | 6$^5$ | | | | | | | | | | |
| | D Svrčina | 1 | 7$^7$ | 3 | WC | M Gigante | 6 | 7$^7$ | | | | | | | | | | |
| WC | M Gigante | 6 | 6$^2$ | 6 | | | | | | WC | M Gigante | 6 | 6$^5$ | 4 | | | | |
| Q | M Guinard | 3 | 7 | 6$^6$ | | | | | | | J De Loore | 3 | 7$^7$ | 6 | | | | |
| | G Blancaneaux | 6 | 5 | 7$^8$ | | G Blancaneaux | 6$^5$ | 7$^7$ | 3 | | | | | | | | | |
| | J De Loore | 4 | 7 | 6 | | J De Loore | 7$^7$ | 6$^4$ | 6 | | | | | | | | | |
| 2 | D Stricker | 6 | 5 | 3 | | | | | | | | | | | | | | |