2019 Citi Open – Men's singles

Nick Kyrgios defeated Daniil Medvedev in the final, 7–6(8–6), 7–6(7–4) to win the men's singles tennis title at the 2019 Washington Open. Kyrgios saved a match point in the semifinals against Stefanos Tsitsipas.

Alexander Zverev was the two-time reigning champion, but did not defend his title.

Seeds
All seeds receive a bye into the second round. • Stefanos Tsitsipas (semifinals)

• 🇷🇺 Karen Khachanov (second round)

• 🇷🇺 Daniil Medvedev (final)

• Kevin Anderson (withdrew)

• 🇺🇸 John Isner (third round)

• Marin Čilić (quarterfinals)

• 🇧🇪 David Goffin (second round)

• 🇨🇦 Milos Raonic (third round)

• 🇨🇦 Félix Auger-Aliassime (third round)

• 🇫🇷 Benoît Paire (quarterfinals)

• 🇫🇷 Gilles Simon (second round)

• 🇦🇺 Alex de Minaur (second round)

• 🇬🇧 Kyle Edmund (quarterfinals)

• 🇩🇪 Jan-Lennard Struff (second round)

• 🇫🇷 Pierre-Hugues Herbert (second round)

• 🇺🇸 Frances Tiafoe (third round)

Seeds
• # 🇨🇦 Brayden Schnur (qualified)

• # 🇩🇪 Peter Gojowczyk (qualifying competition, lucky loser)

• # 🇧🇾 Ilya Ivashka (qualifying competition, lucky loser)

• # 🇸🇰 Norbert Gombos (qualifying competition, lucky loser)

• # 🇷🇸 Viktor Troicki (qualifying competition)

• # 🇫🇷 Nicolas Mahut (qualifying competition)

• # 🇺🇸 Michael Mmoh (first round)

• # 🇺🇸 Noah Rubin (first round)

• # Mikael Torpegaard (qualified)

• # 🇦🇺 Marc Polmans (qualified)

• # 🇮🇳 Ramkumar Ramanathan (first round)

• # 🇺🇸 Donald Young (qualified)

Qualifiers
• # 🇨🇦 Brayden Schnur

• # 🇺🇸 Donald Young

• # Mikael Torpegaard

• # 🇺🇸 Tim Smyczek

• # 🇺🇸 Thai-Son Kwiatkowski

• # 🇦🇺 Marc Polmans

Lucky losers
• # 🇧🇾 Ilya Ivashka

• # 🇩🇪 Peter Gojowczyk

• # 🇸🇰 Norbert Gombos