2019 Citi Open – Men's singles

Men's singles
2019 Citi Open
Champion Nick Kyrgios
Runner-up Daniil Medvedev
Score7–6(8–6), 7–6(7–4)
Draw48 (6Q / 4WC)
Seeds16

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.