Some of America's most prestigious universities have been rocked by protests in recent weeks as students and other agitators take over quads
After an early break for the 2-1 lead, the 23-year-old German 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 139 mph, just shy of his personal record of 142 mph.
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 fifth seed moved nimbly around the court.
"I'm in the quarterfinals and that can only be a good thing," said Zverev, who reached the Australian Open semifinals earlier this year.
"I've been waiting for this moment for six months."
Meanwhile, Kazakhstan's Yulia Putintseva reached the US Open quarter-finals with a 6-3 2-6 6-4 victory over eighth seed Petra Martic in a see-saw encounter at Flushing Meadows on Sunday.
Putintseva surged into a 5-0 lead in 19 minutes on her way to taking the opening set but Croatian Martic appeared to have turned the match in her favour by easing through the second.
With Putintseva needing treatment on her back during the second set, it appeared Martic was poised to reach the last eight. Instead it was Putintseva who romped away into a 5-1 lead before nerves crept in.
Martic clawed back three games before having her own injury timeout to deal with a foot injury - giving Putintseva plenty of time to think about the task of winning one more game.
On the resumption though Putintseva held herself together and sealed victory as Martic drilled a backhand into the net.
American Jennifer Brady reached a Grand Slam quarterfinal for the first time Sunday, dismantling former world number one Angelique Kerber in straight sets at the US Open.
The 25-year-old needed just 1hr 29min to sweep aside the three-time Grand Slam-winning German 6-1, 6-4 to move into the last eight at Flushing Meadows.
It was the first time Brady had made the fourth round at the Billie Jean King National Tennis Center in New York since 2017.
She had failed to get past the first round in her last two outings.
Her previous joint-best appearance at a Grand Slam came when she reached the last 16 of the Australian Open in 2017.
Brady, seeded 28th, broke serve four times and smashed 25 winners against the 17th-seeded Kerber, the 2016 US Open champion.
Some of America's most prestigious universities have been rocked by protests in recent weeks as students and other agitators take over quads
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