_____ won the men’s singles title in the Washington Open (Citi Open) 2019 ?

1) Michael Venus
2) Nick Kyrgios
3) Daniil Medvedev
4) Raven Klaasen

Explanation:
The Washington Open (Citi Open) 2019 was held at the William H.G. FitzGerald Tennis Center in Washington DC, United States from July 29- August 4, 2019. It was the 51st Edition for Men’s Category & 9th Edition for Women’s Category. The tournament was a part of the Association of Tennis Professionals (ATP) World Tour 500 series of the 2019 ATP World Tour, and of the Women’s Tennis Association (WTA) International tournaments of the 2019 WTA Tour. Nick Kyrgios beats Daniil Medvedev and won men’s singles title.