# 2023 Hamburg Ladies & Gents Cup – Men's singles

Alexander Ritschard was the defending champion but chose not to defend his title.
Illya Marchenko won the title after defeating Dennis Novak 6–2, 6–3 in the final.

## Seeds

* Dennis Novak (final)
* Adam Walton (quarterfinals)
* Máté Valkusz (quarterfinals)
* Rudolf Molleker (first round)
* Frederico Ferreira Silva (first round)
* Cem İlkel (second round)
* Maximilian Neuchrist (second round)
* Oleksii Krutykh (first 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 |
| 1 | Dennis Novak | 4 | 6 | 6 | | | | |
| Q | Tristan Lamasine | 6 | 3 | 4 | | | | |
| Q | Tristan Lamasine | 6 | 3 | 4 | 1 | Dennis Novak | 2 | 3 |
| | | | | | | Illya Marchenko | 6 | 6 |
| | Billy Harris | 5 | 6 | 5 | | Illya Marchenko | 6 | 6 |
| | Illya Marchenko | 7 | 3 | 7 | | | | |

### 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 | D Novak | 7$^7$ | 6 | | | | | | | | | | | | | | | |
| WC | M Topo | 6$^2$ | 1 | | 1 | D Novak | 6 | 7 | | | | | | | | | | |
| Q | Lucas Gerch | 3 | 6$^5$ | | | A Bellier | 3 | 5 | | | | | | | | | | |
| | A Bellier | 6 | 7$^7$ | | | | | | | 1 | D Novak | 6 | 6 | | | | | |
| | D Added | 2 | 7 | 4 | | | | | | Q | J Barranco Cosano | 2 | 2 | | | | | |
| Q | J Barranco Cosano | 6 | 5 | 6 | Q | J Barranco Cosano | 6 | 2 | 6 | | | | | | | | | |
| | G Debru | 6 | 6 | | | G Debru | 3 | 6 | 4 | | | | | | | | | |
| 5 | F Ferreira Silva | 4 | 1 | | | | | | | | | | | 1 | D Novak | 4 | 6 | 6 |
| 4/WC | R Molleker | 3 | 4 | | | | | | | | | | | Q | T Lamasine | 6 | 3 | 4 |
| Q | A Santillan | 6 | 6 | | Q | A Santillan | 6 | 7 | | | | | | | | | | |
| | N Gombos | 2 | 5 | | WC | M Möller | 4 | 5 | | | | | | | | | | |
| WC | M Möller | 6 | 7 | | | | | | | Q | A Santillan | 4 | 2 | | | | | |
| Q | T Lamasine | 6 | 6 | | | | | | | Q | T Lamasine | 6 | 6 | | | | | |
| | M Guinard | 0 | 0 | | Q | T Lamasine | 7 | 6 | | | | | | | | | | |
| | M Echargui | 4 | 4 | | 7 | M Neuchrist | 5 | 4 | | | | | | | | | | |
| 7 | M Neuchrist | 6 | 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 |
| 6 | C İlkel | 6 | 3 | | | | | | | | | | | | | | | |
| | H Laaksonen | 2 | 1$^r$ | | 6 | C İlkel | 6$^4$ | 1 | | | | | | | | | | |
| | N Sánchez Izquierdo | 4 | 2 | | | B Harris | 7$^7$ | 6 | | | | | | | | | | |
| | B Harris | 6 | 6 | | | | | | | | B Harris | 4 | 6 | 6 | | | | |
| | S Napolitano | 1 | 6 | 6 | | | | | | 3 | M Valkusz | 6 | 0 | 2 | | | | |
| Q | D Masur | 6 | 2 | 4 | | S Napolitano | 7$^7$ | 4 | 4 | | | | | | | | | |
| | N Serdarušić | 4 | 4 | | 3 | M Valkusz | 6$^5$ | 6 | 6 | | | | | | | | | |
| 3 | M Valkusz | 6 | 6 | | | | | | | | | | | | B Harris | 5 | 6 | 5 |
| 8 | O Krutykh | 2 | 3 | | | | | | | | | | | | I Marchenko | 7 | 3 | 7 |
| | I Marchenko | 6 | 6 | | | I Marchenko | 6 | 3 | 7$^7$ | | | | | | | | | |
| Q | M Sasikumar | 5 | 6$^3$ | | | A Çelikbilek | 4 | 6 | 6$^3$ | | | | | | | | | |
| | A Çelikbilek | 7 | 7$^7$ | | | | | | | | I Marchenko | 6 | 6 | | | | | |
| Alt | K Ivanovski | 2 | 4 | | | | | | | 2 | A Walton | 4 | 1 | | | | | |
| | J Sels | 6 | 6 | | | J Sels | 6 | 3 | 3 | | | | | | | | | |
| Alt | E Kırkın | 2 | 4 | | 2 | A Walton | 3 | 6 | 6 | | | | | | | | | |
| 2 | A Walton | 6 | 6 | | | | | | | | | | | | | | | |