After a similar start at 3-3, Kyrios won nine of the last 11 games, had a single break point and held 12 elusive serves.
Kyrios has not competed since reaching the singles final at Wimbledon, where he lost to defending champion Novak Djokovic of Serbia.
The neutral athlete, the first-seeded Andrejs Rublyov (ATP 8th), also won the men’s singles, who defeated British Jack Draper (ATP 81st) 6-4, 6-2 in the second round match.
Rublyov’s opponent in the third round will be one of the hosts – Jack Sock (ATP 105) or Maksim Cressi (ATP 32).
Meanwhile, in the women’s singles, the current US Open champion Emma Radukana (WTA 10th) from Great Britain reached the second round on Tuesday, beating home Luisa Chirico (WTA 213th) 6-4, 6-2 in the first round match.
This was Radukan’s first win since losing in the second round of the Wimbledon tennis championship.
In the second round of the Washington tournament, Radukana will meet the Colombian Maria Camila Osorio (WTA 67th).
Two-time Australian Championship winner and former world leader Victoria Azarenka (WTA 20th) also reached the second round on Tuesday, defeating Ukrainian Dayana Jastremska (WTA 77th) 6-4, 6-0.
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