2017 Citi Open – Men's singles

Gaël Monfils was the defending champion, but lost in the second round to Yuki Bhambri.

Alexander Zverev won the title, defeating Kevin Anderson in the final, 6–4, 6–4.

Seeds
All seeds received a bye into the second round. • #🇦🇹 Dominic Thiem (third round)

• #🇯🇵 Kei Nishikori (semifinals)

• #🇨🇦 Milos Raonic (quarterfinals)

• #🇧🇬 Grigor Dimitrov (third round)

• #🇩🇪 Alexander Zverev (champion)

• #🇫🇷 Gaël Monfils (second round)

• #🇫🇷 Lucas Pouille (second round)

• #🇺🇸 Jack Sock (semifinals)

• #🇺🇸 John Isner (withdrew due to knee injury)

• #🇦🇺 Nick Kyrgios (second round, retired)

• #🇱🇺 Gilles Müller (third round)

• #🇩🇪 Mischa Zverev (second round)

• #🇦🇷 Juan Martín del Potro (third round)

• #🇺🇸 Steve Johnson (second round)

• # Kevin Anderson (final)

• #🇺🇸 Ryan Harrison (second round)

Qualifying
The top two seeds receive a bye into the qualifying competition.

Seeds
• # 🇮🇳 Ramkumar Ramanathan (qualified)

• # 🇮🇳 Yuki Bhambri (qualified)

• # 🇦🇺 Marc Polmans (qualifying competition, lucky loser)

• # 🇺🇸 Austin Krajicek (qualifying competition)

• # 🇮🇱 Edan Leshem (qualified)

• # 🇧🇷 João Pedro Sorgi (qualifying competition)

• # 🇺🇸 Sekou Bangoura (qualified)

• # 🇮🇹 Alessandro Bega (qualified)

• # 🇬🇧 Liam Broady (qualifying competition)

• # 🇨🇴 Alejandro González (qualifying competition)

• # 🇦🇺 Marinko Matosevic (qualifying competition)

• # 🇺🇸 Wil Spencer (first round)

Qualifiers
• # 🇮🇳 Ramkumar Ramanathan

• # 🇮🇳 Yuki Bhambri

• # 🇺🇸 Alexios Halebian

• # 🇺🇸 Sekou Bangoura

• # 🇮🇱 Edan Leshem

• # 🇮🇹 Alessandro Bega

Lucky loser

 * 1) 🇦🇺 Marc Polmans