# 2019 OEC Kaohsiung – Singles

The 2019 OEC Kaohsiung-Singles was a men's tennis tournament held from September 16 to September 22, 2019, at Kaohsiung, Taiwan. Gaël Monfils was the defending champion but chose not to defend his title.
John Millman won the title after defeating Marc Polmans 6–4, 6–2 in the final.

## Seeds

All seeds receive a bye into the second round.
* Kamil Majchrzak (third round)
* Prajnesh Gunneswaran (third round)
* John Millman (champion)
* Bernard Tomic (withdrew)
* Jiří Veselý (quarterfinals)
* Jason Jung (third round)
* Go Soeda (third round)
* Yūichi Sugita (third round)
* Alex Bolt (quarterfinals)
* Marc Polmans (final)
* Yasutaka Uchiyama (third round)
* Steven Diez (semifinals)
* Andrew Harris (third round)
* Enrique López Pérez (quarterfinals)
* Yosuke Watanuki (second round)
* Hiroki Moriya (third 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 |
| | Frederico Ferreira Silva | 6 | 7$^8$ | | | | | | | | | | |
| 9 | Alex Bolt | 4 | 6$^6$ | | | | | | | | | | |
| 9 | Alex Bolt | 4 | 6$^6$ | | | Frederico Ferreira Silva | 1 | 7 | 5 | | | | |
| | | | | | 10 | Marc Polmans | 6 | 5 | 7 | | | | |
| | Nam Ji-sung | 6 | 1 | 4 | 10 | Marc Polmans | 6 | 5 | 7 | | | | |
| 10 | Marc Polmans | 3 | 6 | 6 | | | | | | | | | |
| 10 | Marc Polmans | 3 | 6 | 6 | | | | | | 10 | Marc Polmans | 4 | 2 |
| | | | | | | | | | | 3 | John Millman | 6 | 6 |
| 5 | Jiří Veselý | 6$^5$ | 1 | | | | | | | | | | | 3 | John Millman | 6 | 6 |
| 3 | John Millman | 7$^7$ | 6 | | | | | | | | | | |
| 3 | John Millman | 7$^7$ | 6 | | 3 | John Millman | 2 | 6 | 6 | | | | |
| | | | | | 12 | Steven Diez | 6 | 3 | 2 | | | | |
| 12 | Steven Diez | 6 | 7$^8$ | | 12 | Steven Diez | 6 | 3 | 2 | | | | |
| 14 | Enrique López Pérez | 3 | 6$^6$ | | | | | | | | | | |

### 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 | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 1 | K Majchrzak | 6 | 6 | | | | | | | | | | |
| | H Bourchier | 3 | 6 | 6 | | H Bourchier | 4 | 4 | | | | | | | | | | |
| Q | Y Takahashi | 6 | 1 | 2 | | | | | | 1 | K Majchrzak | 6$^3$ | 5 | | | | | |
| | T-l Wu | 6$^3$ | 3 | | | | | | | | F Ferreira Silva | 7$^7$ | 7 | | | | | |
| | F Ferreira Silva | 7$^7$ | 6 | | | F Ferreira Silva | 7$^8$ | 1 | 6 | | | | | | | | | |
| | | | | | 15 | Yo Watanuki | 6$^6$ | 6 | 3 | | | | | | | | | |
| | | | | | | | | | | | | | | | | F Ferreira Silva | 6 | 7$^8$ |
| | | | | | | | | | | | | | | | 9 | A Bolt | 4 | 6$^6$ |
| | | | | | 9 | A Bolt | 7 | 6 | | | | | | | | | | |
| | Y-s Chung | 4 | 3 | | PR | M Niesten | 5 | 4 | | | | | | | | | | |
| PR | Miliaan Niesten | 6 | 6 | | | | | | | 9 | A Bolt | 7 | 4 | 7$^8$ | | | | |
| | Shintaro Imai | 3 | 4 | | | | | | | 6 | J Jung | 5 | 6 | 6$^6$ | | | | |
| | Renta Tokuda | 6 | 6 | | | R Tokuda | 2 | 3 | | | | | | | | | | |
| | | | | | 6 | J Jung | 6 | 6 | | | | | | | | | | |

#### Section 2

| First round | 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 | Quarterfinals | Quarterfinals |
| | | | | | LL | Tsai Chang-lin | 4 | 1 | | | | | | | | | | |
| | J-s Nam | 4 | 6 | 3 | | J-s Nam | 6 | 6 | | | | | | | | | | |
| WC | C-y Yu | 6 | 2 | 1$^r$ | | | | | | J-s Nam | 6 | 6 | | | | | | |
| WC | C-p Hsieh | 2 | 2 | | | | | | 13 | A Harris | 2 | 2 | | | | | | |
| | T-h Yang | 6 | 6 | | | T-h Yang | 6$^6$ | 3 | | | | | | | | | | |
| | | | | | 13 | A Harris | 7$^8$ | 6 | | | | | | | | | | |
| | | | | | | | | | | | | | | | J-s Nam | 6 | 1 | 4 |
| | | | | | | | | | | | | | | 10 | M Polmans | 3 | 6 | 6 |
| | | | | | 10 | M Polmans | 6 | 6 | | | | | | | | | | |
| | S Mukund | 7$^{10}$ | 3 | 7$^8$ | | S Mukund | 4 | 1 | | | | | | | | | | |
| | G Oliveira | 6$^8$ | 6 | 6$^6$ | | | | | 10 | M Polmans | 1 | 7$^{11}$ | 6 | | | | | |
| LL | K-y Lee | 2 | 3 | | | | | | 7 | G Soeda | 6 | 6$^9$ | 3 | | | | | |
| | C-h Tseng | 6 | 6 | | | C-h Tseng | 2 | 3 | | | | | | | | | | |
| | | | | | 7 | G Soeda | 6 | 6 | | | | | | | | | | |

### Bottom half
#### Section 3

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 5 | J Veselý | 7$^8$ | 6 | | | | | | | | |
| | T Gabashvili | 6 | 5 | 6 | | T Gabashvili | 6$^6$ | 1 | | | | | | | | |
| | C Altamirano | 3 | 7 | 4 | | | | | 5 | J Veselý | 7 | 6 | | | | |
| | A Santillan | 6 | 7 | | | | | | 11 | Y Uchiyama | 5 | 2 | | | | |
| WC | Y-h Hsu | 3 | 5 | | | A Santillan | 6$^5$ | 3 | | | | | | | | |
| | | | | | 11 | Y Uchiyama | 7$^7$ | 6 | | | | | | | | |
| | | | | | | | | | | | | | 5 | J Veselý | 6$^5$ | 1 |
| | | | | | | | | | | | | | 3 | J Millman | 7$^7$ | 6 |
| | | | | | 16 | H Moriya | 6 | 6 | | | | | | | | |
| | J Ward | 4 | 6 | 4 | | K Uchida | 4 | 2 | | | | | | | | |
| | K Uchida | 6 | 0 | 6 | | | | | 16 | H Moriya | 2 | 6$^2$ | | | | |
| | R Noguchi | 6 | 6 | | | | | | 3 | J Millman | 6 | 7$^7$ | | | | |
| WC | Lo Chien-hsun | 2 | 2 | | | R Noguchi | 1 | 2 | | | | | | | | |
| | | | | | 3 | J Millman | 6 | 6 | | | | | | | | |

#### 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 | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 8 | Y Sugita | 7$^7$ | 4 | 6 | | | | | | | | | |
| | S Myneni | 6 | 1 | 3 | | M Purcell | 6$^2$ | 6 | 2 | | | | | | | | | |
| | M Purcell | 3 | 6 | 6 | | | | | | 8 | Y Sugita | 2 | 4 | | | | | |
| Q | Jumpei Yamasaki | 6$^7$ | 4 | | | | | | | 12 | S Diez | 6 | 6 | | | | | |
| | L Saville | 7$^9$ | 6 | | | L Saville | 6 | 4 | 1 | | | | | | | | | |
| | | | | | 12 | S Diez | 3 | 6 | 6 | | | | | | | | | |
| | | | | | | | | | | | | | | | 12 | S Diez | 6 | 7$^8$ |
| | | | | | | | | | | | | | | | 14 | E López Pérez | 3 | 6$^6$ |
| | | | | | 14 | E López Pérez | 6 | 6 | | | | | | | | | | |
| | Jacob Grills | 4 | 6 | 2 | | E King | 3 | 3 | | | | | | | | | | |
| | E King | 6 | 3 | 6 | | | | | | 14 | E López Pérez | 5 | 7 | 6 | | | | |
| WC | R Ho | 6$^6$ | 3 | | | | | | | 2 | P Gunneswaran | 7 | 5 | 4 | | | | |
| | Shuichi Sekiguchi | 7$^8$ | 6 | | | S Sekiguchi | 3 | 2 | | | | | | | | | | |
| | | | | | 2 | P Gunneswaran | 6 | 6 | | | | | | | | | | |