American Brandon Nakashima, the No. 13 seed, advanced to the round of 16 at the Citi Open after defeating Australian Christopher O’Connell 6-2, 6-2 at the William H.G. FitzGerald Tennis Center in Washington. Nakashima, ranked No. 54, will face the winner of the match between qualifier Radu Albot and American Ben Shelton, the second seed, in the next round. In the previous round, O’Connell, ranked No. 94, overcame Frenchman Harold Mayot to reach this stage. Other second-round results from the Washington ATP 500 tournament at the William H.G. FitzGerald Tennis Center are listed below.