# 2019 Kobe Challenger – Singles

Tatsuma Ito was the defending champion but retired in the second round to Tseng Chun-hsin.
Yosuke Watanuki won the title after defeating Yūichi Sugita 6–2, 6–4 in the final.

## Seeds

All seeds receive a bye into the second round.
* Yasutaka Uchiyama (second round, retired)
* Yūichi Sugita (final)
* Go Soeda (quarterfinals)
* James Duckworth (second round)
* Tatsuma Ito (second round, retired)
* Zhang Zhizhen (withdrew)
* Enrique López Pérez (second round)
* Jay Clarke (third round)
* Ramkumar Ramanathan (quarterfinals)
* Bai Yan (second round)
* Hiroki Moriya (quarterfinals)
* Wu Tung-lin (second round)
* Li Zhe (second round)
* Akira Santillan (second round, retired)
* Lee Duck-hee (second round)
* Nam Ji-sung (quarterfinals, retired)

## 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 |
| 16 | Nam Ji-sung | 4 | 2$^r$ | | | | | | | | | | |
| | Yosuke Watanuki | 6 | 2 | | | | | | | | | | |
| | Yosuke Watanuki | 6 | 2 | | | Yosuke Watanuki | 6 | 6 | | | | | |
| | | | | | | Tim van Rijthoven | 1 | 2 | | | | | |
| 3 | Go Soeda | 3 | 6 | 6$^6$ | | Tim van Rijthoven | 1 | 2 | | | | | |
| | Tim van Rijthoven | 6 | 3 | 7$^8$ | | | | | | | | | |
| | Tim van Rijthoven | 6 | 3 | 7$^8$ | | | | | | | Yosuke Watanuki | 6 | 6 |
| | | | | | | | | | | 2 | Yūichi Sugita | 2 | 4 |
| 11 | Hiroki Moriya | 3 | 6$^4$ | | | | | | | | | | | 2 | Yūichi Sugita | 2 | 4 |
| | Shintaro Imai | 6 | 7$^7$ | | | | | | | | | | |
| | Shintaro Imai | 6 | 7$^7$ | | | Shintaro Imai | 3 | 6 | 1 | | | | |
| | | | | | 2 | Yūichi Sugita | 6 | 4 | 6 | | | | |
| 9 | Ramkumar Ramanathan | 2 | 3 | | 2 | Yūichi Sugita | 6 | 4 | 6 | | | | |
| 2 | Yūichi Sugita | 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 | Y Uchiyama | 5 | 2$^r$ | | | | | | | | | | |
| WC | Yuki Mochizuki | 2 | 6 | 3 | WC | Y Mochizuki | 7 | 3 | | | | | | | | | | |
| | Makoto Ochi | 6 | 2 | 0$^r$ | | | | | | WC | Y Mochizuki | 3 | 6 | 1 | | | | |
| | B Patael | 6 | 6 | | | | | | | 16 | J-s Nam | 6 | 1 | 6 | | | | |
| | Shuichi Sekiguchi | 3 | 2 | | | B Patael | 2 | 4 | | | | | | | | | | |
| | | | | | 16 | J-s Nam | 6 | 6 | | | | | | | | | | |
| | | | | | | | | | | | | | | | 16 | J-s Nam | 4 | 2$^r$ |
| | | | | | | | | | | | | | | | | Yo Watanuki | 6 | 2 |
| | | | | | 10 | Y Bai | 3 | 1 | | | | | | | | | | |
| LL | Kazuki Nishiwaki | 3 | 4 | | | Yo Watanuki | 6 | 6 | | | | | | | | | | |
| | Yo Watanuki | 6 | 6 | | | | | | | | Yo Watanuki | 6 | 6 | | | | | |
| Q | T Khabibulin | 0 | 2 | | | | | | | WC | T Ichikawa | 2 | 1 | | | | | |
| WC | T Ichikawa | 6 | 6 | | WC | T Ichikawa | 5 | 6 | 7$^8$ | | | | | | | | | |
| | | | | | 7 | E López Pérez | 7 | 2 | 6$^6$ | | | | | | | | | |

#### 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 | G Soeda | 7$^8$ | 6 | | | | | | | | | | | |
| | A Kadhe | 6$^8$ | 3 | | P Niklas-Salminen | 6$^6$ | 2 | | | | | | | | | | | |
| | P Niklas-Salminen | 7$^{10}$ | 6 | | | | | | 3 | G Soeda | 0 | 6 | 7 | | | | | |
| Alt | Takashi Saito | 6$^1$ | 3 | | | | | | | S Shimabukuro | 6 | 3 | 5 | | | | | |
| | S Shimabukuro | 7$^7$ | 6 | | S Shimabukuro | 3 | 7$^7$ | 6 | | | | | | | | | | |
| | | | | 13 | Z Li | 6 | 6$^5$ | 4 | | | | | | | | | | |
| | | | | | | | | | | | | | | 3 | G Soeda | 3 | 6 | 6$^6$ |
| | | | | | | | | | | | | | | | T van Rijthoven | 6 | 3 | 7$^8$ |
| | | | | 12 | T-l Wu | 7$^7$ | 4 | 6$^3$ | | | | | | | | | | |
| | T van Rijthoven | 6 | 6 | | T van Rijthoven | 6$^2$ | 6 | 7$^7$ | | | | | | | | | | |
| | G Oliveira | 1 | 4 | | | | | | | T van Rijthoven | 7$^7$ | 7$^{10}$ | | | | | | |
| | B Klein | 6$^4$ | 3 | | | | | | | L Saville | 6$^2$ | 6$^8$ | | | | | | |
| | L Saville | 7$^7$ | 6 | | L Saville | 6 | 6 | | | | | | | | | | | |
| | | | | Alt | Ken Onishi | 2 | 2 | | | | | | | | | | | |

### 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 | Quarterfinals |
| | | | | 5 | T Ito | 3 | 0$^r$ | | | | | | | | | |
| | C-h Tseng | 6 | 6 | | C-h Tseng | 6 | 3 | | | | | | | | | |
| | B Sant'Anna | 3 | 0 | | | | | | C-h Tseng | 5 | 2 | | | | | |
| LL | Ren Nakamura | 6$^4$ | 0 | | | | | 11 | H Moriya | 7 | 6 | | | | | |
| WC | S Hazawa | 7$^7$ | 6 | WC | S Hazawa | 6$^5$ | 4 | | | | | | | | | |
| | | | | 11 | H Moriya | 7$^7$ | 6 | | | | | | | | | |
| | | | | | | | | | | | | | 11 | H Moriya | 3 | 6$^4$ |
| | | | | | | | | | | | | | | S Imai | 6 | 7$^7$ |
| | | | | 15 | D-h Lee | 4 | 2 | | | | | | | | | |
| | Shintaro Imai | 6 | 6 | | S Imai | 6 | 6 | | | | | | | | | |
| WC | S Watanabe | 4 | 2 | | | | | | S Imai | 3 | 6 | 6 | | | | |
| | Renta Tokuda | 6 | 6 | | | | | | R Tokuda | 6 | 3 | 2 | | | | |
| Q | Yuta Kawahashi | 3 | 1 | | R Tokuda | 6 | 6 | | | | | | | | | |
| | | | | 4 | J Duckworth | 2 | 2 | | | | | | | | | |

#### 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 | J Clarke | 6 | 3 | 6 | | | | | | | | | |
| WC | Ryota Tanuma | 6 | 4 | 7$^8$ | WC | R Tanuma | 3 | 6 | 3 | | | | | | | | | |
| | T Niki | 3 | 6 | 6$^6$ | | | | | | 8 | J Clarke | 3 | 3 | | | | | |
| PR | B Mousley | 2 | 3$^r$ | | | | | | | 9 | R Ramanathan | 6 | 6 | | | | | |
| | Jumpei Yamasaki | 6 | 4 | | | J Yamasaki | 4 | 1 | | | | | | | | | | |
| | | | | | 9 | R Ramanathan | 6 | 6 | | | | | | | | | | |
| | | | | | | | | | | | | | | | 9 | R Ramanathan | 2 | 3 |
| | | | | | | | | | | | | | | | 2 | Y Sugita | 6 | 6 |
| | | | | | 14 | A Santillan | 6 | 4 | 0$^r$ | | | | | | | | | |
| | T-h Yang | 2 | 3 | | | T Gabashvili | 3 | 6 | 0 | | | | | | | | | |
| | T Gabashvili | 6 | 6 | | | | | | | | T Gabashvili | 7$^7$ | 3 | 3 | | | | |
| | Y-s Chung | 7$^7$ | 7$^7$ | | | | | | | 2 | Y Sugita | 6$^4$ | 6 | 6 | | | | |
| | Y Takahashi | 6$^3$ | 6$^1$ | | | Y-s Chung | 1 | 4 | | | | | | | | | | |
| | | | | | 2 | Y Sugita | 6 | 6 | | | | | | | | | | |