Far from daunted, Alexei Popyrin is promising to take the fight to Jannik Sinner as the Australian underdog plots another monster US Open upset.
Popyrin is drawing on the memories of his seismic victory over Novak Djokovic last year in New York after setting up a second-round blockbuster with the top-seeded Sinner.
Popyrin immediately turned his attention to taking on the defending champion and world No.1 after blasting 10 aces and 44 winners to see off Finland's Emil Ruusuvuori 6-3 6-4 7-6 (7-3) in just over two hours on Tuesday (Wednesday AEST).