US Open 2021: Novak Djokovic beats Kei Nishikori to reach fourth round – as it happened

• Djokovic wins 6-7 (4), 6-3, 6-3, 6-2 to reach last 16
• Emma Raducanu wins 6-0, 6-1 to reach fourth round

10.54pm BST

That's all for today. Thanks for following along with us and be sure to join us for more minute-by-minute coverage as the tournament moves forward.

10.43pm BST

It was a really amazing match to be a part of, a great experience," Djokovic says. Big credit to Kei, who played at a very, very high level today. Tough luck for him but he deserves a round of applause. I always knew that he possesses a lot of qualities. He's been on the tour for quite a few years, but I must say that he did surprise me with his level today. He was playing very quick. It was tough. Even though I won three, three and two (in the) second, third and fourth sets, I felt like all the sets were quite close. A few points really decided the winner today. So a huge congratulations for a great fight to him."

Asked to assess his level, Djokovic offers a typically thoughttful response.