Alexei Popyrin made bold Novak Djokovic claim weeks before US Open upset 0 31.08.2024 07:50 Express.co.uk (tennis) Alexei Popyrin previously predicted that he'd be able to defeat Novak Djokovic, who he shockingly defeated at the US Open in four sets, 6-4 6-4 2-6 6-4.