“The chances are getting better as the years ago on – although not by much,” said Norrie, who is ranked 35th in the world.
“The level he brings and the competitiveness he brings is crazy. Every time I’ve played him he changes tactics and makes it difficult.
“I’m ready for anything – him playing unreal, or him not playing great and stopping the match for something, then playing good.”
Djokovic looked unsteady on his feet in humid conditions during his first-round win over Learner Tien and needed treatment for a blister on his toe.
Seventh seed Djokovic had not played for six weeks before the US Open and showed more signs of rustiness on Wednesday, dropping a set against American qualifier Zachary Svajda.
It is always dangerous to suggest Djokovic looks vulnerable, and Norrie is certainly wary.
But Norrie’s brand of tennis – trying to make things physical and drag Djokovic into an energy-sapping scrap – could be key if the former world number eight is to snap his losing streak against the Serb great.
“”I will have to beat him with physicality,” said Norrie, who showed his own survival instincts in a four-set battle against Argentina’s Francisco Comesana on Wednesday.
“I did see the blister but he’s the king of adversity. He fights and pushes through it.
“I’m not going to be a servebot and serve him off the court.”
