# 2020 Koblenz Open – Singles

Gianluca Mager was the defending champion but chose not to defend his title.
Tomáš Macháč won the title after defeating Botic van de Zandschulp 6–3, 4–6, 6–3 in the final.

## Seeds

All seeds receive a bye into the second round.
* Yannick Maden (quarterfinals)
* Yannick Hanfmann (quarterfinals)
* Tallon Griekspoor (third round)
* Oscar Otte (second round)
* Maxime Janvier (second round)
* Botic van de Zandschulp (final)
* Quentin Halys (third round)
* Mats Moraing (second round)
* Julian Lenz (second round)
* Dustin Brown (third round)
* Nicola Kuhn (semifinals)
* Ruben Bemelmans (semifinals)
* Daniel Masur (quarterfinals)
* Teymuraz Gabashvili (second round)
* Lucas Miedler (second round)
* Pavel Kotov (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

| Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final | Final |
| 1 | Yannick Maden | 6 | 4 | 4 | | | | | | | | | | |
| 6 | Botic van de Zandschulp | 4 | 6 | 6 | | | | | | | | | | |
| 6 | Botic van de Zandschulp | 4 | 6 | 6 | 6 | Botic van de Zandschulp | 6 | 3 | 6 | | | | | |
| | | | | | 11 | Nicola Kuhn | 4 | 6 | 2 | | | | | |
| 13 | Daniel Masur | 7 | 6$^2$ | 2 | 11 | Nicola Kuhn | 4 | 6 | 2 | | | | | |
| 11 | Nicola Kuhn | 5 | 7$^7$ | 6 | | | | | | | | | | |
| 11 | Nicola Kuhn | 5 | 7$^7$ | 6 | | | | | | 6 | Botic van de Zandschulp | 3 | 6 | 3 |
| | | | | | | | | | | | Tomáš Macháč | 6 | 4 | 6 |
| | Dimitar Kuzmanov | 4 | 4 | | | | | | | | | | | | Tomáš Macháč | 6 | 4 | 6 |
| | Tomáš Macháč | 6 | 6 | | | | | | | | | | | |
| | Tomáš Macháč | 6 | 6 | | | Tomáš Macháč | 6 | 6 | | | | | | |
| | | | | | 12 | Ruben Bemelmans | 2 | 4 | | | | | | |
| 12 | Ruben Bemelmans | 6 | 6 | | 12 | Ruben Bemelmans | 2 | 4 | | | | | | |
| 2 | Yannick Hanfmann | 3 | 2 | | | | | | | | | | | |

### Top half
#### Section 1

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 1 | Y Maden | 3 | 7$^7$ | 6 | | | | | | | | | |
| WC | L Wessels | 6 | 6 | | WC | L Wessels | 6 | 6$^5$ | 3 | | | | | | | | | |
| | Peter Heller | 3 | 2 | | | | | | | 1 | Y Maden | 6 | 6 | | | | | |
| LL | E Kırkın | 4 | 6 | 6 | | | | | | LL | E Kırkın | 3 | 0 | | | | | |
| | B Hassan | 6 | 1 | 4 | LL | E Kırkın | 6 | 6$^5$ | 7 | | | | | | | | | |
| | | | | | 16 | P Kotov | 4 | 7$^7$ | 5 | | | | | | | | | |
| | | | | | | | | | | | | | | 1 | Y Maden | 6 | 4 | 4 |
| | | | | | | | | | | | | | | 6 | B van de Zandschulp | 4 | 6 | 6 |
| | | | | | 9 | J Lenz | 1 | 3 | | | | | | | | | | |
| | M Marterer | 6 | 7$^7$ | | | M Marterer | 6 | 6 | | | | | | | | | | |
| | E Struvay | 3 | 6$^5$ | | | | | | | | M Marterer | 4 | 2 | | | | | |
| | K Żuk | 6 | 3 | 6$^4$ | | | | | | 6 | B van de Zandschulp | 6 | 6 | | | | | |
| | I Sijsling | 4 | 6 | 7$^7$ | | I Sijsling | | | | | | | | | | | | |
| | | | | | 6 | B van de Zandschulp | w/o | | | | | | | | | | | |

#### Section 2

| First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | 3 | T Griekspoor | 6 | 2 | 7$^7$ | | | | | | | | | | |
| | E Dalla Valle | 1 | 4 | Q | L Gerch | 4 | 6 | 6$^3$ | | | | | | | | | | |
| Q | Lucas Gerch | 6 | 6 | | | | | | 3 | T Griekspoor | 7 | 3 | 1 | | | | | |
| | V Šafránek | 6 | 6 | | | | | | 13 | D Masur | 5 | 6 | 6 | | | | | |
| | Christopher Heyman | 4 | 2 | | V Šafránek | 7 | 6$^2$ | 2 | | | | | | | | | | |
| | | | | 13 | D Masur | 5 | 7$^7$ | 6 | | | | | | | | | | |
| | | | | | | | | | | | | | | 13 | D Masur | 7 | 6$^2$ | 2 |
| | | | | | | | | | | | | | | 11 | N Kuhn | 5 | 7$^7$ | 6 |
| | | | | 11 | N Kuhn | 6 | 6 | | | | | | | | | | | |
| | A Bega | 6 | 6 | | A Bega | 3 | 2 | | | | | | | | | | | |
| | E Leshem | 1 | 2 | | | | | | 11 | N Kuhn | 6 | 7$^7$ | | | | | | |
| | M Bašić | 6 | 6 | | | | | | | M Bašić | 4 | 6$^4$ | | | | | | |
| | Y Mertens | 3 | 1 | | M Bašić | 6 | 6 | | | | | | | | | | | |
| | | | | 8 | M Moraing | 4 | 4 | | | | | | | | | | | |

### Bottom half
#### Section 3

| First round | First round | First round | First round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | 5 | M Janvier | 4 | 5 | | | | | | | | |
| | D Kuzmanov | 6 | 6 | | D Kuzmanov | 6 | 7 | | | | | | | | |
| | V Orlov | 2 | 1 | | | | | | D Kuzmanov | 4 | 6 | 6 | | | |
| | U Ignatik | 6 | 6 | | | | | 10 | D Brown | 6 | 3 | 4 | | | |
| WC | Nino Ehrenschneider | 1 | 1 | | U Ignatik | 4 | 4 | | | | | | | | |
| | | | | 10 | D Brown | 6 | 6 | | | | | | | | |
| | | | | | | | | | | | | | D Kuzmanov | 4 | 4 |
| | | | | | | | | | | | | | T Macháč | 6 | 6 |
| | | | | 14 | T Gabashvili | 0 | 3 | | | | | | | | |
| WC | Leopold Zima | 2 | 2 | | T Macháč | 6 | 6 | | | | | | | | |
| | T Macháč | 6 | 6 | | | | | | T Macháč | 6 | 6 | | | | |
| WC | M Gengel | 4 | 3 | | | | | | V Kopřiva | 3 | 3 | | | | |
| | V Kopřiva | 6 | 6 | | V Kopřiva | 6 | 7$^7$ | | | | | | | | |
| | | | | 4 | O Otte | 4 | 6$^4$ | | | | | | | | |

#### Section 4

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 7 | Q Halys | 7 | 6 | | | | | | | | | |
| WC | M Welte | 6 | 4 | 6 | WC | M Welte | 5 | 2 | | | | | | | | | |
| | A Pavlásek | 1 | 6 | 4 | | | | | | 7 | Q Halys | 2 | 4 | | | | |
| | D Added | 5 | 4 | | | | | | | 12 | R Bemelmans | 6 | 6 | | | | |
| | A Dubrivnyy | 7 | 6 | | | A Dubrivnyy | 3 | 1 | | | | | | | | | |
| | | | | | 12 | R Bemelmans | 6 | 6 | | | | | | | | | |
| | | | | | | | | | | | | | | 12 | R Bemelmans | 6 | 6 |
| | | | | | | | | | | | | | | 2 | Y Hanfmann | 3 | 2 |
| | | | | | 15 | L Miedler | 6$^1$ | 4 | | | | | | | | | |
| Q | S Mukund | 6 | 6 | | Q | S Mukund | 7$^7$ | 6 | | | | | | | | | |
| | FC Jianu | 3 | 2 | | | | | | | Q | S Mukund | 5 | 4 | | | | |
| | M Eriksson | 2 | 2 | | | | | | | 2 | Y Hanfmann | 7 | 6 | | | | |
| | M Vrbenský | 6 | 6 | | | M Vrbenský | 7$^9$ | 4 | 6$^5$ | | | | | | | | |
| | | | | | 2 | Y Hanfmann | 6$^7$ | 6 | 7$^7$ | | | | | | | | |