"Novak Djokovic, the Serbian champion, encounters a fresh challenge at the US Open."

"On August 30th, Friday, Djokovic competed against Alexei Popyrin in an exciting third-round match at the US Open."

Popyrin surprised the audience by winning the initial two sets, 6-4, 6-4, with a demonstration of Big-Man Tennis.

"Djokovic made a comeback in the third set, securing a 6-2 victory by successfully converting all three break points."

Djokovic has come back from being behind by two sets eight times in his career, including at the US Open last year.

The 37-year-old is in pursuit of her 25th major title, which would extend her record, following her success of winning three Grand Slam titles last year.