# 2018 RBC Tennis Championships of Dallas – Singles

Ryan Harrison was the defending champion but chose not to defend his title.
Kei Nishikori won the title after defeating Mackenzie McDonald 6–1, 6–4 in the final.

## Seeds

* Kei Nishikori (champion)
* Frances Tiafoe (second round)
* Taylor Fritz (quarterfinals)
* Bjorn Fratangelo (first round)
* Alexander Bublik (first round)
* Yannick Hanfmann (first round)
* Tim Smyczek (quarterfinals)
* Tommy Paul (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 | Final | Final | Final | Final |
| 1/WC | Kei Nishikori | 6 | 6 | | | | |
| | Jason Jung | 4 | 4 | | | | |
| | Jason Jung | 4 | 4 | 1/WC | Kei Nishikori | 6 | 6 |
| | | | | | Mackenzie McDonald | 1 | 4 |
| | Denis Kudla | 4 | 4 | | Mackenzie McDonald | 1 | 4 |
| | Mackenzie McDonald | 6 | 6 | | | | |

### 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 | Semifinals | Semifinals | Semifinals | Semifinals |
| 1/WC | K Nishikori | 6 | 6 | | | | | | | | | | | | | | |
| | D Novikov | 3 | 3 | | 1/WC | K Nishikori | 4 | 6 | 6 | | | | | | | | |
| | M Bachinger | 2 | 6 | 6 | | M Bachinger | 6 | 4 | 4 | | | | | | | | |
| Q | E Karlovskiy | 6 | 3 | 4 | | | | | | 1/WC | K Nishikori | 7$^7$ | 6 | | | | |
| LL | Francesco Ferrari | 7$^8$ | 2 | 2 | | | | | | LL | D Köpfer | 6$^3$ | 3 | | | | |
| LL | D Köpfer | 6$^6$ | 6 | 6 | LL | D Köpfer | 6 | 7 | | | | | | | | | |
| | G Oliveira | 7$^7$ | 7$^7$ | | | G Oliveira | 0 | 5 | | | | | | | | | |
| 6 | Y Hanfmann | 6$^3$ | 6$^5$ | | | | | | | | | | | 1/WC | K Nishikori | 6 | 6 |
| 4 | B Fratangelo | 4 | 6 | 4 | | | | | | | | | | | J Jung | 4 | 4 |
| | M Kecmanović | 6 | 3 | 6 | | M Kecmanović | 7$^7$ | 6$^5$ | 7$^7$ | | | | | | | | |
| | A Krajicek | 6 | 6 | | | A Krajicek | 6$^4$ | 7$^7$ | 6$^4$ | | | | | | | | |
| | F Peliwo | 3 | 3 | | | | | | | | M Kecmanović | 1 | 1 | | | | |
| | B Schnur | 7 | 2 | 6$^7$ | | | | | | | J Jung | 6 | 6 | | | | |
| Q | Jared Hiltzik | 5 | 6 | 7$^9$ | Q | J Hiltzik | 6 | 1 | 4 | | | | | | | | |
| | J Jung | 6 | 6 | | | J Jung | 4 | 6 | 6 | | | | | | | | |
| 5 | A Bublik | 4 | 4 | | | | | | | | | | | | | | |

### 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 |
| 8 | T Paul | 6 | 6 | | | | | | | | | | | | | |
| Q | J Šátral | 3 | 3 | | 8 | T Paul | 6$^6$ | 4 | | | | | | | | |
| | D Kudla | 6 | 6 | | | D Kudla | 7$^8$ | 6 | | | | | | | | |
| WC | P Kypson | 3 | 1 | | | | | | | | D Kudla | 6 | 6 | | | |
| | B Klahn | 6 | 2 | 6 | | | | | | 3 | T Fritz | 3 | 3 | | | |
| | M Giron | 4 | 6 | 4 | | B Klahn | 4 | 6 | 6$^2$ | | | | | | | |
| Q | Í Cervantes | 2 | 7 | 1 | 3 | T Fritz | 6 | 2 | 7$^7$ | | | | | | | |
| 3 | T Fritz | 6 | 5 | 6 | | | | | | | | | | D Kudla | 4 | 4 |
| 7 | T Smyczek | 6 | 4 | 6 | | | | | | | | | | M McDonald | 6 | 6 |
| | M Krueger | 1 | 6 | 3 | 7 | T Smyczek | 6 | 6 | | | | | | | | |
| | A Pavić | 6 | 6$^6$ | 6$^9$ | | A Collarini | 4 | 4 | | | | | | | | |
| | A Collarini | 1 | 7$^8$ | 7$^{11}$ | | | | | | 7 | T Smyczek | 4 | 2 | | | |
| | M McDonald | 7 | 6 | | | | | | | | M McDonald | 6 | 6 | | | |
| | T Ito | 5 | 3 | | | M McDonald | 7 | 2 | 6 | | | | | | | |
| | S Kozlov | 2 | 6$^5$ | | 2/WC | F Tiafoe | 5 | 6 | 3 | | | | | | | |
| 2/WC | F Tiafoe | 6 | 7$^7$ | | | | | | | | | | | | | |