Maria Sakkari has recovered to take the last four games and beat top-seeded Jessica Pegula 6-3, 4-6, 6-2 after letting a huge lead slip away in the DC Open semifinals.
John Isner believes in his chances against Rafael Nadal in the second round of the Italian Open.
Novak Djokovic is 26-0 in Grand Slam matches in 2021.
Novak Djokovic has moved into the third round of the U.S. Open as he tries to complete a calendar-year Grand Slam and collect a 21st major championship.
Two-time Grand Slam runner-up Karolina Pliskova has saved a match point and edged 75th-ranked American Amanda Anisimova in three sets to reach the U.S. Open’s third round.