Fourth-seeded Zverev, the highest-ranked player in his half of the draw after Britain's second-ranked Andy Murray withdrew Saturday, crashed out of the year's final Grand Slam event Wednesday, falling to Croatia's 61st-ranked Borna Coric 3-6, 7-5, 7-6 (7/1), 7-6 (7/4).
"It's upsetting. Today was upsetting. The way I played was upsetting. The tournament so far is upsetting for me," Zverev said.
"I was the highest-ranked player in the bottom half of the draw after Andy retired. Now I'm out of the draw."
"I know that I could have done some big things here. I know that I could have done something that I haven't done before. But I won't. It's just as simple as that," Zverev said.
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"It's upsetting because the draw is pretty open in the bottom part. I felt like I should have been the favorite there. I just played a very, very bad match, so it's unfortunate."
"I've been dealing with expectations from a very young age," Zverev said. "I don't think about it. I just try to play every match the same way. Luckily for me most of the time this year I was winning."
On the Grandstand court, nicknamed the "Graveyard of Champions" after past upsets, Zverev made 58 unforced errors with 22 aces and 43 winners.
"Physically I'm fine. I just played very, very bad in the second and third set," Zverev said. "I should have won the third. I definitely should have won the fourth.
Coric won the last five points of the 12th game in the final set after Zverev was one point from breaking to force a fifth set.
"He played really well on the breakpoints. Maybe had a little bit of luck on his side as well," Zverev said. "Caught the line, had a few let cords and stuff like this.
"Everything was just a little bit against me."
Zverev was inconsolable when it came to having him ponder the season-ending ATP Finals or other future events.
"I just lost the second round of a major where I shouldn't have lost, so I'm not thinking about the rest of the year," he said.
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