# 2018 Stockholm Open – Singles

Juan Martín del Potro was the two-time defending champion but chose not to defend his title.
Stefanos Tsitsipas won his first ATP World Tour title, defeating Ernests Gulbis in the final, 6–4, 6–4. With the win, he became the first Greek player to win an ATP title in the organization's 48-year history. Gulbis lost his first ATP Tour final, after six singles titles in a row.

## Seeds

The top four seeds receive a bye into the second round.
* John Isner (semifinals)
* Fabio Fognini (semifinals)
* Stefanos Tsitsipas (champion)
* Jack Sock (quarterfinals)
* Lucas Pouille (first round)
* Chung Hyeon (quarterfinals, retired)
* Denis Shapovalov (second round)
* Fernando Verdasco (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 |
| 1 | John Isner | 6 | 3 | 3 | | | | |
| Q | Ernests Gulbis | 1 | 6 | 6 | | | | |
| Q | Ernests Gulbis | 1 | 6 | 6 | Q | Ernests Gulbis | 4 | 4 |
| | | | | | 3 | Stefanos Tsitsipas | 6 | 6 |
| 3 | Stefanos Tsitsipas | 6 | 6 | | 3 | Stefanos Tsitsipas | 6 | 6 |
| 2 | Fabio Fognini | 3 | 2 | | | | | |

### 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| | | | | | 1 | J Isner | 7$^7$ | 6$^5$ | 7$^7$ | | | | | | | | | | |
| | B Klahn | 6 | 3 | 6 | | B Klahn | 6$^2$ | 7$^7$ | 6$^5$ | | | | | | | | | | |
| | M Copil | 2 | 6 | 4 | | | | | | 1 | J Isner | 7$^{10}$ | 6$^5$ | 7$^7$ | | | | | |
| Q | O Otte | 6 | 7 | | | | | | | | T Sandgren | 6$^8$ | 7$^7$ | 6$^2$ | | | | | |
| LL | J Zopp | 3 | 5 | | Q | O Otte | 6$^4$ | 6 | 3 | | | | | | | | | | |
| | T Sandgren | 6 | 6 | | | T Sandgren | 7$^7$ | 3 | 6 | | | | | | | | | | |
| 5 | L Pouille | 4 | 4 | | | | | | | | | | | | 1 | J Isner | 6 | 3 | 3 |
| | | | | | | | | | | | | | | | Q | E Gulbis | 1 | 6 | 6 |
| | | | | | 4 | J Sock | 7 | 3 | 6 | | | | | | | | | | |
| WC | E Ymer | 4 | 7 | 7 | WC | E Ymer | 5 | 6 | 3 | | | | | | | | | | |
| | M Marterer | 6 | 5 | 5 | | | | | | 4 | J Sock | 6 | 3 | 4 | | | | | |
| WC | M Ymer | 4 | 3 | | | | | | | Q | E Gulbis | 4 | 6 | 6 | | | | | |
| Q | E Gulbis | 6 | 6 | | Q | E Gulbis | 6 | 6 | | | | | | | | | | | |
| Q | P Polansky | 3 | 7 | 5 | 7 | D Shapovalov | 2 | 4 | | | | | | | | | | | |
| 7 | D Shapovalov | 6 | 5 | 7 | | | | | | | | | | | | | | | |

### 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 | Semifinals | Semifinals | Semifinals | Semifinals |
| 8 | F Verdasco | 6 | 6 | | | | | | | | | | | | | | |
| | M Ebden | 4 | 2 | | 8 | F Verdasco | 6 | 5 | 6$^5$ | | | | | | | | |
| | A de Minaur | 6$^3$ | 7$^7$ | 1 | | P Kohlschreiber | 4 | 7 | 7$^7$ | | | | | | | | |
| | P Kohlschreiber | 7$^7$ | 6$^2$ | 6 | | | | | | | P Kohlschreiber | 3 | 6$^4$ | | | | |
| | J Millman | 4 | 6 | 6 | | | | | | 3 | S Tsitsipas | 6 | 7$^7$ | | | | |
| Q | A Popyrin | 6 | 3 | 2 | | J Millman | 4 | 6 | 3 | | | | | | | | |
| | | | | | 3 | S Tsitsipas | 6 | 3 | 6 | | | | | | | | |
| | | | | | | | | | | | | | | 3 | S Tsitsipas | 6 | 6 |
| 6/WC | H Chung | 6 | 6 | | | | | | | | | | | 2 | F Fognini | 3 | 2 |
| | T Fritz | 2 | 2 | | 6/WC | H Chung | 6 | 6 | | | | | | | | | |
| | D Kudla | 6 | 7 | | | D Kudla | 3 | 3 | | | | | | | | | |
| | G García López | 2 | 5 | | | | | | | 6/WC | H Chung | 5 | 1$^r$ | | | | |
| | L Lacko | 6 | 6 | | | | | | | 2 | F Fognini | 7 | 2 | | | | |
| | T Daniel | 1 | 4 | | | L Lacko | 4 | 4 | | | | | | | | | |
| | | | | | 2 | F Fognini | 6 | 6 | | | | | | | | | |

## Qualifying
### Seeds

* Julien Benneteau (qualifying competition)
* Bernard Tomic (first round, retired)
* Michael Mmoh (first round)
* Peter Polansky (qualified)
* Jürgen Zopp (qualifying competition, lucky loser)
* Matthias Bachinger (qualifying competition)
* Ernests Gulbis (qualified)
* Mats Moraing (first round)

### Qualifiers

* Ernests Gulbis
* Oscar Otte
* Alexei Popyrin
* Peter Polansky

### Lucky loser

* Jürgen Zopp

### Qualifying draw
#### First qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 1 | Julien Benneteau | 6 | 6 | | | | |
| | Ivan Nedelko | 4 | 2 | | | | |
| | Ivan Nedelko | 4 | 2 | 1 | Julien Benneteau | 1 | 4 |
| | | | | 7 | Ernests Gulbis | 6 | 6 |
| WC | Markus Eriksson | 4 | 6$^1$ | 7 | Ernests Gulbis | 6 | 6 |
| 7 | Ernests Gulbis | 6 | 7$^7$ | | | | |

#### Second qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 2 | Bernard Tomic | 4 | 2$^r$ | | | | |
| | Oscar Otte | 6 | 1 | | | | |
| | Oscar Otte | 6 | 1 | | Oscar Otte | 6 | 7$^7$ |
| | | | | 5 | Jürgen Zopp | 3 | 6$^2$ |
| | Matteo Donati | 4 | 4 | 5 | Jürgen Zopp | 3 | 6$^2$ |
| 5 | Jürgen Zopp | 6 | 6 | | | | |

#### Third qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 3 | Michael Mmoh | 6$^5$ | 6$^7$ | | | | | |
| | Alexei Popyrin | 7$^7$ | 7$^9$ | | | | | |
| | Alexei Popyrin | 7$^7$ | 7$^9$ | | Alexei Popyrin | 6 | 4 | 6 |
| | | | | 6 | Matthias Bachinger | 3 | 6 | 2 |
| | Norbert Gombos | 3 | 4 | 6 | Matthias Bachinger | 3 | 6 | 2 |
| 6 | Matthias Bachinger | 6 | 6 | | | | | |

#### Fourth qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 4 | Peter Polansky | 6 | 6 | | | | | |
| WC | Karl Friberg | 4 | 1 | | | | | |
| WC | Karl Friberg | 4 | 1 | 4 | Peter Polansky | 6 | 1 | 6 |
| | | | | | Andrea Arnaboldi | 4 | 6 | 4 |
| | Andrea Arnaboldi | 7 | 6 | | Andrea Arnaboldi | 4 | 6 | 4 |
| 8 | Mats Moraing | 5 | 2 | | | | | |