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'Painful to watch': Tennis world stunned by 'awful' US Open moment

Alexander Zverev stunned the tennis world with a horrendous serving display in his fourth-round loss at the US Open.

The sixth seed doubled-faulted 17 times in his round of 16 exit to Diego Schwartzman, the Argentine taking full advantage to close out a 3-6 6-2 6-4 6-3 victory in three hours and eight minutes.

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Zverev's serving problems have dogged him for months and they came back in force against Schwartzman, who advanced to the quarter-finals at Flushing Meadows for the second time in the past three years.

Alexander Zverev, pictured here while serving at the US Open.
Alexander Zverev's serving woes were on full display. Image: ESPN

One shocking serve in the first set left fans speechless, the ball bouncing before it hit the net.

Another serve in the second set sailed way long and wide, nowhere near its intended target.

Fans and pundits couldn’t believe what they were seeing.

Schwartzman, the diminutive 20th seed, broke serve eight times with the almost two metre-tall Zverev winning just 32 per cent of second-serve points and amassing 65 unforced errors.

"Alex had many problems with his serve. I am a big returner and took my chances," Schwartzman said.

"That helped me a lot. I knew I had the chance to win this match."

Ugly scenes late in match

Zverev was hit with a point penalty for swearing in the final set to put Schwartzman up 5-2.

The world No.6 pleaded in vain he had been unaware of being warned before for slamming the ball into the crowd and was backed up by Schwartzman, but the point penalty stood.

Alexander Zverev and Diego Schwartzman, pictured here during their US Open clash.
Alexander Zverev and Diego Schwartzman discuss the point penalty. (Photo by Al Bello/Getty Images)

The relentless Schwartzman played solidly from the baseline to deny Zverev his first quarter-final appearance in New York and move through to a meeting with second-seeded Rafael Nadal or 22nd-seeded Croatian Marin Cilic.

For Schwartzman the win was just his sixth in 28 attempts against a top-10 opponent, sending him through to the last eight at a major tournament for only the third time.

"It was great to play with this crowd, they helped in every important moment," Schwartzman said.

with AAP