Last year's US Open runner-up Daniil Medvedev is through to the semi-finals after beating yellow Russian Andrey Rublev in straight sets on Thursday (NZ time).
The first Russian duo in the quarter-finals at a Grand Slam since Igor Andreev and Nikolay Davydenko at Roland Garros in 2007, Medvedev showed no hesitation during a ruthless, controlled display that sends him through to the last four without dropping a set.
Medvedev required treatment for a shoulder injury and cramp midway through the third set, but battled through to secure victory.
No player in the Open Era has won the US Open men's title without dropping a set.
With Roger Federer and Rafa Nadal missing, and top seed Novak Djokovic having been disqualified for hitting a line judge with a ball, Medvedev showed why he is now the bookmakers' favourite to win in New York.
The third seed never gave Rublev a break chance in the entire match while hammering down 16 aces.
Medvedev lost an epic five-setter to Nadal in last year's final.
Second seed Dominic Thiem put in a sublime performance to dismantle Australian Alex de Minaur's challenge during a 6-1 6-2 6-4 victory and canter into the semi-finals.
The 27-year-old Thiem, the highest seed surviving at Flushing Meadows, had not previously lost to the Australian and started their third career meeting on a brisk note, breaking De Minaur's serve three consecutive times to win the opening set.
De Minaur started on a more positive note in the second, winning 11 straight points on serve to go up 40-0 in the fifth before being broken with Thiem serving out the stanza with a double break.
The Austrian's early lead in the third set evaporated as De Minaur kept fighting but a second break of serve sealed the match for Thiem, who will next meet Russian Daniil Medvedev for a place in his fourth Grand Slam final.
Reuters.
