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)