Overview

• The No. 7 seed defeated Cameron Norrie 6-4, 6-7 (4), 6-2, 6-3 on Arthur Ashe Stadium, hitting 18 aces in his best serving display of the tournament.
• He left the court for a first-set medical timeout for a lower-back issue, then received a courtside back massage and pills early in the second set.
• At 38, he is the oldest man to reach the US Open last 16 since Jimmy Connors in 1991 and he matched Roger Federer’s record with a 69th trip to a major’s fourth round.
• Norrie’s loss ended Britain’s remaining men’s singles involvement at this year’s US Open.
• The flare-up continues a season trend after a torn hamstring in Melbourne and a groin tweak at Wimbledon, though Djokovic said he felt “as young as ever.”