The 2018 RBC Tennis Championships of Dallas was a professional tennis tournament played on hard courts. It was the 21st edition of the tournament and part of the 2018 ATP Challenger Tour. It took place in Dallas, United States between 29 January and 4 February 2018.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
 Japan | Kei Nishikori | 24 | 1 | |
| Frances Tiafoe | 81 | 2 | ||
| Taylor Fritz | 91 | 3 | ||
| Bjorn Fratangelo | 104 | 4 | ||
 Kazakhstan | Alexander Bublik | 112 | 5 | |
| Yannick Hanfmann | 115 | 6 | ||
| Tim Smyczek | 131 | 7 | ||
| Tommy Paul | 150 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
Íñigo Cervantes
Jared Hiltzik
Evgeny Karlovskiy
Jan ŠátralThe following players received entry as lucky losers:
Francesco FerrariSee main article: 2018 RBC Tennis Championships of Dallas – Singles.
Kei Nishikori def. Mackenzie McDonald 6–1, 6–4.See main article: 2018 RBC Tennis Championships of Dallas – Doubles.
Jeevan Nedunchezhiyan / Christopher Rungkat def. Leander Paes / 
Joe Salisbury 6–4, 3–6, [10–7].