German fifth seed Alexander Zverev hurled down 18 aces en route to demolishing Alejandro Davidovich Fokina 6-2 6-2 6-1 in the fourth round of the US Open.
After an early break for the 2-1 lead, the 23-year-old never let his Spanish opponent get a foothold in the match.
He produced 39 winners and dropped just one service game during a ruthless performance.
Davidovich Fokina grabbed a 2-0 lead in the second set but the advantage was shortlived as Zverev broke back before racing away with the set. He sealed it with an ace.
The Spaniard barely had a chance to make an impact on the world number seven's serve, the fastest clocking at 223 kph, just shy of his personal record of 228.5 kph.
Davidovich Fokina, who took a medical time out to treat a foot problem, tried to rattle Zverev by attempting some drop shots but the fleet-footed German moved nimbly around the court.
"I'm in the quarter-finals and that can only be a good thing," said Zverev, who reached the Australian Open semi-finals earlier this year.
"I've been waiting for this moment for six months."
Denis Shapovalov overcame a terrible first set tie-break to beat David Goffin 6-7(0-7) 6-3 6-4 6-3 and become the first Canadian man to advance to the US Open quarter-finals in the Open era.
Shapovalov will next face Spain's Pablo Carreno Busta after the 20th seed was awarded his fourth round match against Novak Djokovic by default when the world No.1 one hit a line judge with a tennis ball.
It will be Shapovalov's first grand slam quarter-final and could lead the way for a Canadian charge into the last eight with compatriots Vasek Pospisil and Felix Auger-Aliassime playing their fourth round clashes on Monday.
After losing the first set, Shapovalov began to find his range with his serve, used his powerful forehand to put pressure on the Belgian's ground strokes and capitalised on his break-point opportunities to advance.