The Spaniard heads to the year's final Grand Slam on the back of a stunning 4-6, 7-6(5), 6-4 second-round defeat by French veteran Gael Monfils at last week's Cincinnati Open and called it the "worst match" of his career.
A frustrated Alcaraz destroyed his racket in the deciding set by repeatedly striking it on the court and was at a loss to explain his dip in form and uncharacteristic implosion.
"I couldn't play. Honestly, I'd been practising really well... The previous days, I was feeling great, hitting the ball clear, moving well. I don't know what happened. I don't know how I felt like this. I couldn't control myself," he said.
"It's really difficult to find some good stuff from this match. So I want to forget it and try to move on... I'll go to New York and try to practise well, get used to those courts."
The humbling Cincinnati defeat came in Alcaraz's first match on hardcourts since his run to the Miami quarter-finals in March shortly after he lifted the Indian Wells title.
The world number three will hope to quickly rediscover that form and can draw strength from his happy memories of playing at Flushing Meadows, where he made his Grand Slam breakthrough as a teenager in 2022 with the first of his four major titles.
The free-swinging Spaniard has never lacked confidence and remains a title contender at the August 26th - September 8th event despite his blip but the resurgence of his main rivals Novak Djokovic and Jannik Sinner is likely to make his path tougher.
Djokovic reignited his disappointing season by outclassing Alcaraz for the Paris Games gold, while Australian Open champion Sinner shrugged off his health issues to reaffirm his hardcourt credentials with the Cincinnati title.
Thwarting the duo could be the big challenge for Alcaraz, whose key target is to finish a stellar season by cementing the year-end number one ranking for the second time.
"I'm focused on going to every tournament, thinking about playing great tennis, doing a good result to get better in the race," Alcaraz said.
"Ending the year as number one is one of my main goals."