# 2019 Santaizi ATP Challenger – Singles

Yuki Bhambri was the defending champion but chose not to defend his title.
Dennis Novak won the title after defeating Sergiy Stakhovsky 6–2, 6–4 in the final.

## Seeds

All seeds receive a bye into the second round.
* Lloyd Harris (third round)
* Evgeny Donskoy (second round)
* Sergiy Stakhovsky (final)
* Lukáš Lacko (third round)
* Matthias Bachinger (second round)
* Kamil Majchrzak (third round)
* Jason Jung (quarterfinals)
* Marcos Baghdatis (second round, retired)
* Ramkumar Ramanathan (quarterfinals)
* Tatsuma Ito (quarterfinals)
* Dennis Novak (champion)
* James Duckworth (third round)
* Kwon Soon-woo (semifinals)
* Hiroki Moriya (second round)
* Yūichi Sugita (quarterfinals)
* Maxime Janvier (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 | Final | Final | Final | Final |
| 13 | Kwon Soon-woo | 7$^8$ | 6 | | | | | | | | | |
| 9 | Ramkumar Ramanathan | 6$^6$ | 3 | | | | | | | | | |
| 9 | Ramkumar Ramanathan | 6$^6$ | 3 | | 13 | Kwon Soon-woo | 3 | 4 | | | | |
| | | | | | 11 | Dennis Novak | 6 | 6 | | | | |
| 15 | Yūichi Sugita | 6$^5$ | 3 | | 11 | Dennis Novak | 6 | 6 | | | | |
| 11 | Dennis Novak | 7$^7$ | 6 | | | | | | | | | |
| 11 | Dennis Novak | 7$^7$ | 6 | | | | | | 11 | Dennis Novak | 6 | 6 |
| | | | | | | | | | 3 | Sergiy Stakhovsky | 2 | 4 |
| 10 | Tatsuma Ito | 6$^3$ | 7$^7$ | 4 | | | | | | | | | 3 | Sergiy Stakhovsky | 2 | 4 |
| 3 | Sergiy Stakhovsky | 7$^7$ | 6$^5$ | 6 | | | | | | | | |
| 3 | Sergiy Stakhovsky | 7$^7$ | 6$^5$ | 6 | 3 | Sergiy Stakhovsky | 7$^7$ | 7$^7$ | | | | |
| | | | | | | Go Soeda | 6$^4$ | 6$^4$ | | | | |
| 7 | Jason Jung | 6$^3$ | 1 | | | Go Soeda | 6$^4$ | 6$^4$ | | | | |
| | Go Soeda | 7$^7$ | 6 | | | | | | | | | |

### Top half
#### Section 1

| 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 |
| | | | | | 1 | L Harris | 7$^9$ | 6 | | | | | | | | | |
| LL | B Klein | 6 | 7 | | LL | B Klein | 6$^7$ | 2 | | | | | | | | | |
| Q | C-p Hsieh | 3 | 5 | | | | | | 1 | L Harris | 5 | 7$^7$ | 3 | | | | |
| Q | S Balaji | 4 | 7$^7$ | 4 | | | | | 13 | S-w Kwon | 7 | 6$^3$ | 6 | | | | |
| | L Saville | 6 | 6$^4$ | 6 | | L Saville | 4 | 4 | | | | | | | | | |
| | | | | | 13 | S-w Kwon | 6 | 6 | | | | | | | | | |
| | | | | | | | | | | | | | | 13 | S-w Kwon | 7$^8$ | 6 |
| | | | | | | | | | | | | | | 9 | R Ramanathan | 6$^6$ | 3 |
| | | | | | 9 | R Ramanathan | 6 | 6 | | | | | | | | | |
| | Y-s Chung | 6 | 6$^5$ | 4 | | M Banes | 3 | 2 | | | | | | | | | |
| | M Banes | 2 | 7$^7$ | 6 | | | | | 9 | R Ramanathan | 4 | 6 | 6 | | | | |
| | C Altamirano | 5 | 7 | 3 | | | | | WC | C-h Lo | 6 | 3 | 2 | | | | |
| WC | Lo Chien-hsun | 7 | 5 | 6 | WC | C-h Lo | 6$^1$ | 4 | | | | | | | | | |
| | | | | | 8 | M Baghdatis | 7$^7$ | 2$^r$ | | | | | | | | | |

#### 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 |
| | | | | 4 | L Lacko | 4 | 7$^7$ | 6 | | | | | | | | | |
| M-A Hüsler | 7$^7$ | 6$^5$ | 6 | | M-A Hüsler | 6 | 6$^0$ | 2 | | | | | | | | | |
| M Purcell | 6$^4$ | 7$^7$ | 1 | | | | | | 4 | L Lacko | 6 | 3 | 4 | | | | |
| S Mukund | 3 | 4 | | | | | | | 15 | Y Sugita | 3 | 6 | 6 | | | | |
| C İlkel | 6 | 6 | | | C İlkel | 5 | 3 | | | | | | | | | | |
| | | | | 15 | Y Sugita | 7 | 6 | | | | | | | | | | |
| | | | | | | | | | | | | | | 15 | Y Sugita | 6$^5$ | 3 |
| | | | | | | | | | | | | | | 11 | D Novak | 7$^7$ | 6 |
| | | | | 11 | D Novak | 6 | 6 | | | | | | | | | | |
| Renta Tokuda | 6 | 6 | | | R Tokuda | 2 | 2 | | | | | | | | | | |
| Y Takahashi | 2 | 1 | | | | | | | 11 | D Novak | 6 | 6$^6$ | 6 | | | | |
| K Uchida | 6 | 6 | | | | | | | | K Uchida | 3 | 7$^8$ | 4 | | | | |
| D-h Lee | 4 | 4 | | | K Uchida | 7$^8$ | 6 | | | | | | | | | | |
| | | | | 5 | M Bachinger | 6$^6$ | 2 | | | | | | | | | | |

### 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 | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 6 | K Majchrzak | 6 | 6 | | | | | | | | | | |
| | A Santillan | 6 | 7$^7$ | | | A Santillan | 3 | 1 | | | | | | | | | | |
| WC | Y-h Hsu | 4 | 6$^5$ | | | | | | 6 | K Majchrzak | 7$^7$ | 6$^7$ | 6$^2$ | | | | | |
| WC | K-y Lee | 6 | 6 | | | | | | 10 | T Ito | 6$^3$ | 7$^9$ | 7$^7$ | | | | | |
| WC | R Ho | 4 | 2 | | WC | K-y Lee | 3 | 3 | | | | | | | | | | |
| | | | | | 10 | T Ito | 6 | 6 | | | | | | | | | | |
| | | | | | | | | | | | | | | 10 | T Ito | 6$^3$ | 7$^7$ | 4 |
| | | | | | | | | | | | | | | 3 | S Stakhovsky | 7$^7$ | 6$^5$ | 6 |
| | | | | | 16 | M Janvier | 6 | 7 | | | | | | | | | | |
| PR | I Marchenko | 6 | 3 | 4 | | TK Wang | 4 | 5 | | | | | | | | | | |
| | TK Wang | 4 | 6 | 6 | | | | | 16 | M Janvier | 5 | 4 | | | | | | |
| | S Robert | 6 | 6 | | | | | | 3 | S Stakhovsky | 7 | 6 | | | | | | |
| | G Oliveira | 3 | 4 | | | S Robert | 6$^2$ | 2 | | | | | | | | | | |
| | | | | | 3 | S Stakhovsky | 7$^7$ | 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 | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 7 | J Jung | 6 | 6 | | | | | | | | | |
| | T-l Wu | 6 | 6 | | | T-l Wu | 4 | 4 | | | | | | | | | |
| WC | C-y Yu | 4 | 3 | | | | | | | 7 | J Jung | 6 | 6 | | | | |
| | Makoto Ochi | 4 | 3 | | | | | | | 12 | J Duckworth | 2 | 2 | | | | |
| | T-h Yang | 6 | 6 | | | T-h Yang | 6$^6$ | 0 | | | | | | | | | |
| | | | | | 12 | J Duckworth | 7$^8$ | 6 | | | | | | | | | |
| | | | | | | | | | | | | | | 7 | J Jung | 6$^3$ | 1 |
| | | | | | | | | | | | | | | | G Soeda | 7$^7$ | 6 |
| | | | | | 14 | H Moriya | 6 | 4 | 4 | | | | | | | | |
| | A Harris | 7$^7$ | 4 | 6 | | A Harris | 4 | 6 | 6 | | | | | | | | |
| | S Myneni | 6$^4$ | 6 | 2 | | | | | | | A Harris | 2 | 3 | | | | |
| | G Soeda | 6$^8$ | 6 | 6 | | | | | | | G Soeda | 6 | 6 | | | | |
| | Y Uchiyama | 7$^{10}$ | 4 | 2 | | G Soeda | 4 | 6 | 7$^7$ | | | | | | | | |
| | | | | | 2 | E Donskoy | 6 | 4 | 6$^5$ | | | | | | | | |