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Draper, who trailed after dropping the opener 6–4, stormed into the second set by breaking Djokovic early and surviving multiple break points before sealing it with aggressive baseline play.

Draper surged to leads of 3-1 and 4-2 in the decider before Djokovic battled back to 5-5 and then broke him as he first served for the match.

The 24 year‑old kept his composure, forced the tie-break and dominated it to close out a statement victory.

"I still don't feel like I'm playing anywhere near the way I want to play," Draper said. "I came out here tonight and won that match through determination. Trying to problem solve, do my best, and have a great attitude. Only up from here, hopefully."

Draper will next face Russian 11th seed Daniil Medvedev, who beat Alex Michelsen 6-2 6-4 in a commanding performance, needing just one hour and 27 minutes to dismantle the American and maintain his strong form after winning last month's Dubai Open.