# 2018 IsarOpen – Singles

This was the first edition of the tournament.
Pedro Sousa won the title after defeating Jan-Lennard Struff 6–1, 6–3 in the final.

## Seeds

* Jan-Lennard Struff (final)
* Jiří Veselý (quarterfinals, retired)
* Jürgen Zopp (second round)
* Paolo Lorenzi (first round)
* Martin Kližan (semifinals)
* Yannick Hanfmann (withdrew)
* Casper Ruud (first round)
* Simone Bolelli (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/WC | Jan-Lennard Struff | 6 | 6 | | | | | |
| 5 | Martin Kližan | 4 | 4 | | | | | |
| 5 | Martin Kližan | 4 | 4 | | 1/WC | Jan-Lennard Struff | 1 | 3 |
| | | | | | | Pedro Sousa | 6 | 6 |
| Q | Kevin Krawietz | 1 | 6 | 1 | | Pedro Sousa | 6 | 6 |
| | Pedro Sousa | 6 | 1 | 6 | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1/WC | J-L Struff | 6 | 4 | 7$^7$ | | | | | | | | | | | | | |
| WC | D Masur | 3 | 6 | 6$^3$ | 1/WC | J-L Struff | 6 | 6 | | | | | | | | | |
| | M Moraing | 6 | 3 | 6 | | M Moraing | 4 | 4 | | | | | | | | | |
| | G Clezar | 2 | 6 | 3 | | | | | 1/WC | J-L Struff | 4 | 6 | 6 | | | | |
| | C Berlocq | 6$^7$ | 6 | 6 | | | | | | C Berlocq | 6 | 3 | 2 | | | | |
| SE | G Oliveira | 7$^9$ | 4 | 4 | | C Berlocq | 7$^7$ | 7 | | | | | | | | | |
| WC | T Pütz | 6 | 3 | 7$^8$ | WC | T Pütz | 6$^3$ | 5 | | | | | | | | | |
| 7 | C Ruud | 2 | 6 | 6$^6$ | | | | | | | | | | 1/WC | J-L Struff | 6 | 6 |
| 3 | J Zopp | 6 | 3 | 6 | | | | | | | | | | 5 | M Kližan | 4 | 4 |
| SE | P Cachin | 4 | 6 | 1 | 3 | J Zopp | 6$^2$ | 4 | | | | | | | | | |
| Q | M Ymer | 4 | 6 | 7 | Q | M Ymer | 7$^7$ | 6 | | | | | | | | | |
| WC | R Molleker | 6 | 4 | 5 | | | | | Q | M Ymer | 3 | 2 | | | | | |
| | K Majchrzak | 6 | 6 | | | | | | 5 | M Kližan | 6 | 6 | | | | | |
| | M Bachinger | 3 | 4 | | | K Majchrzak | 3 | 3 | | | | | | | | | |
| | R Ojeda Lara | 3 | 2 | | 5 | M Kližan | 6 | 6 | | | | | | | | | |
| 5 | M Kližan | 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 | Semifinals |
| 8 | S Bolelli | 3 | 4 | | | | | | | | | | | | | | | | |
| | S Ofner | 6 | 6 | | | S Ofner | 6 | 6$^4$ | 6$^8$ | | | | | | | | | | |
| | Z Kolář | 3 | 4 | | Q | K Krawietz | 3 | 7$^7$ | 7$^{10}$ | | | | | | | | | | |
| Q | K Krawietz | 6 | 6 | | | | | | | Q | K Krawietz | 5 | 6 | 6 | | | | | |
| LL | A Avidzba | 6 | 3 | 6 | | | | | | Q | G Mager | 7 | 3 | 1 | | | | | |
| | F Mayer | 3 | 6 | 3 | LL | A Avidzba | 6$^4$ | 3 | | | | | | | | | | | |
| Q | G Mager | 6 | 3 | 6 | Q | G Mager | 7$^7$ | 6 | | | | | | | | | | | |
| 4 | P Lorenzi | 4 | 6 | 2 | | | | | | | | | | | Q | K Krawietz | 1 | 6 | 1 |
| LL | A Müller | 3 | 2 | | | | | | | | | | | | | P Sousa | 6 | 1 | 6 |
| | P Sousa | 6 | 6 | | | P Sousa | 6 | 1 | 7$^7$ | | | | | | | | | | |
| | O Otte | 6 | 3 | 5 | | P Martínez | 4 | 6 | 6$^5$ | | | | | | | | | | |
| | P Martínez | 3 | 6 | 7 | | | | | | | P Sousa | 5 | 5 | | | | | | |
| LL | A De Greef | 2 | 7 | 1 | | | | | | 2 | J Veselý | 7 | 2$^r$ | | | | | | |
| Q | K Coppejans | 6 | 5 | 6 | Q | K Coppejans | 5 | 6 | 6$^4$ | | | | | | | | | | |
| | A Vatutin | 7$^7$ | 5 | 0 | 2 | J Veselý | 7 | 1 | 7$^7$ | | | | | | | | | | |
| 2 | J Veselý | 6$^5$ | 7 | 6 | | | | | | | | | | | | | | | |