Kyrgios loses

Nick Kyrgios, who won the Citi Open two years ago, lost his first match of this year’s tournament, 6-4, 6-4 to Mackenzie McDonald on Tuesday in Washington. McDonald, a 26-year-old Californian who played college tennis at UCLA, saved all five break points he faced Tuesday, including a pair while serving out the victory. He’ll next face No. 13 seed Benoit Paire. Two younger Americans won earlier: Sebastian Korda, who is less than a month past his 21st birthday, and Brandon Nakashima, who turned 20 on Tuesday. The 12th-seeded Korda moved into the third round by beating Vasek Pospisil of Canada 7-5, 6-4. Wild-card entry Nakashima, the runner-up in his past two ATP appearances, defeated Alexei Popyrin of Australia 6-3, 6-3 in a first-round match.