2015 U.S. Men's Clay Court Championships – Singles

Fernando Verdasco was the defending champion, but lost to Sam Querrey in the semifinals. Jack Sock won his first ATP singles title, defeating Querrey in the final, 7–6(11–9), 7–6(7–2).

Seeds
The top four seeds receive a bye into the second round.

🇪🇸 Feliciano López (quarterfinals) 🇪🇸 Roberto Bautista Agut (second round) Kevin Anderson (semifinals) 🇺🇸 John Isner (second round) 🇨🇴 Santiago Giraldo (quarterfinals) 🇪🇸 Fernando Verdasco (semifinals) 🇫🇷 Jérémy Chardy (quarterfinals) 🇺🇸 Sam Querrey (final)

Seeds
• # 🇦🇹 Jürgen Melzer (first round)

• # 🇨🇴 Alejandro González (first round)

• # 🇯🇵 Tatsuma Ito (first round)

• # 🇦🇷 Facundo Bagnis (second round)

• # 🇺🇸 Ryan Harrison (first round)

• # 🇰🇷 Chung Hyeon (qualified)

• # Gastão Elias (first round)

• # 🇩🇪 Alexander Zverev (first round)

Qualifiers
• # 🇦🇷 Facundo Argüello

• # 🇰🇷 Chung Hyeon

• # 🇧🇷 Rogério Dutra Silva

• # 🇧🇷 Guilherme Clezar