# 2018 Santaizi ATP Challenger – Singles

Lu Yen-hsun was the defending champion but chose not to defend his title.
Yuki Bhambri won the title after defeating Ramkumar Ramanathan 6–3, 6–4 in the final.

## Seeds

* Matthew Ebden (second round)
* Evgeny Donskoy (quarterfinals)
* Dudi Sela (quarterfinals)
* Yuki Bhambri (champion)
* Quentin Halys (first round)
* Ramkumar Ramanathan (final)
* Go Soeda (semifinals)
* Tatsuma Ito (semifinals)

## 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 |
| 8 | Tatsuma Ito | 6 | 3 | 4 | | | | |
| 4 | Yuki Bhambri | 3 | 6 | 6 | | | | |
| 4 | Yuki Bhambri | 3 | 6 | 6 | 4 | Yuki Bhambri | 6 | 6 |
| | | | | | 6 | Ramkumar Ramanathan | 3 | 4 |
| 6 | Ramkumar Ramanathan | 7$^{11}$ | 6 | | 6 | Ramkumar Ramanathan | 3 | 4 |
| 7 | Go Soeda | 6$^9$ | 4 | | | | | |

### 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 | M Ebden | 6 | 6 | | | | | | | | | | | | | | | | |
| | T-h Yang | 3 | 4 | | 1 | M Ebden | 2 | 6$^4$ | | | | | | | | | | | |
| | J Jung | 6 | 6 | | | J Jung | 6 | 7$^7$ | | | | | | | | | | | |
| LL | Jacob Grills | 0 | 3 | | | | | | | | J Jung | 6 | 6$^9$ | 6$^4$ | | | | | |
| | A Bolt | 6$^5$ | 6 | 3 | | | | | | 8 | T Ito | 3 | 7$^{11}$ | 7$^7$ | | | | | |
| | S-w Kwon | 7$^7$ | 4 | 6 | | S-w Kwon | 6 | 6$^4$ | 4 | | | | | | | | | | |
| | L Grigelis | 7$^7$ | 4 | 3 | 8 | T Ito | 4 | 7$^7$ | 6 | | | | | | | | | | |
| 8 | T Ito | 6$^5$ | 6 | 6 | | | | | | | | | | | 8 | T Ito | 6 | 3 | 4 |
| 4 | Y Bhambri | 6$^5$ | 6 | 6 | | | | | | | | | | | 4 | Y Bhambri | 3 | 6 | 6 |
| | R Ortega Olmedo | 7$^7$ | 3 | 3 | 4 | Y Bhambri | 6 | 6 | | | | | | | | | | | |
| | K Majchrzak | 6 | 2 | 6$^5$ | | M Bachinger | 4 | 4 | | | | | | | | | | | |
| | M Bachinger | 4 | 6 | 7$^7$ | | | | | | 4 | Y Bhambri | 6 | 6 | | | | | | |
| WC | C-h Tseng | 6$^4$ | 1 | | | | | | | Q | C-h Lo | 4 | 2 | | | | | | |
| | Y Takahashi | 7$^7$ | 6 | | | Y Takahashi | 3 | 7$^7$ | 3 | | | | | | | | | | |
| Q | Lo Chien-hsun | 6 | 1 | 6 | Q | C-h Lo | 6 | 6$^5$ | 6 | | | | | | | | | | |
| 5 | Q Halys | 3 | 6 | 3 | | | | | | | | | | | | | | | |

### 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 |
| 6 | R Ramanathan | 7$^7$ | 6$^0$ | 6 | | | | | | | | | | | | | |
| Q | T Fancutt | 6$^5$ | 7$^7$ | 2 | 6 | R Ramanathan | 7$^7$ | 6$^3$ | 7$^7$ | | | | | | | | |
| | L Harris | 6 | 7$^7$ | | | L Harris | 6$^3$ | 7$^7$ | 6$^5$ | | | | | | | | |
| LL | S Mukund | 4 | 6$^3$ | | | | | | | 6 | R Ramanathan | 6 | 6 | | | | |
| WC | T-l Wu | 6 | 7$^7$ | | | | | | | 3 | D Sela | 4 | 2 | | | | |
| | A Whittington | 3 | 6$^1$ | | WC | T-l Wu | 3 | 6 | 3 | | | | | | | | |
| Q | Shuichi Sekiguchi | 4 | 2 | | 3 | D Sela | 6 | 1 | 6 | | | | | | | | |
| 3 | D Sela | 6 | 6 | | | | | | | | | | | 6 | R Ramanathan | 7$^{11}$ | 6 |
| 7 | G Soeda | 7$^7$ | 6 | | | | | | | | | | | 7 | G Soeda | 6$^9$ | 4 |
| | D Kelly | 6$^4$ | 4 | | 7 | G Soeda | 6 | 6 | | | | | | | | | |
| WC | T Chen | 7$^{10}$ | 6 | | WC | T Chen | 3 | 1 | | | | | | | | | |
| Q | R Roelofse | 6$^8$ | 3 | | | | | | | 7 | G Soeda | 7$^7$ | 6 | | | | |
| PR | S Myneni | 4 | 7$^7$ | 6 | | | | | | 2 | E Donskoy | 6$^4$ | 4 | | | | |
| | P Gunneswaran | 6 | 6$^2$ | 4 | PR | S Myneni | 2 | 4 | | | | | | | | | |
| WC | Y-h Hsu | 1 | 1 | | 2 | E Donskoy | 6 | 6 | | | | | | | | | |
| 2 | E Donskoy | 6 | 6 | | | | | | | | | | | | | | |