Overview

• Novak Djokovic defeated Cameron Norrie 6-4, 6-7 (4), 6-2, 6-3 after a first-set lower-back issue that prompted an off-court medical timeout.
• He received a back massage on the changeover and took medication from a doctor before settling into his best serving performance of the tournament with 18 aces.
• The win makes him the oldest man since Jimmy Connors in 1991 to reach the US Open fourth round and ties Roger Federer with 69 last-16 appearances at majors.
• Djokovic also logged his 192nd Grand Slam match victory on hard courts, extending the men’s record confirmed by the ATP and AP reports.
• After the match he acknowledged heightened concern about his physical resilience this season and will next face German qualifier Jan-Lennard Struff.