Argentine 28th seed Del Potro defeated the 19-time Grand Slam champion 7-5, 3-6, 7-6 (10/8), 6-4 in Arthur Ashe Stadium, a court where Federer has dominated rivals from more than a decade.
"I think it's my home court too," Del Potro told the crowd. "You make me feel happy every time when I play here and I love your support."
Del Potro said he hopes to repeat his 2009 victory over Nadal ahead of his epic five-set victory over Federer to capture his only Grand Slam title.
"He's number one in the world, but with this amazing support anything can happen."
Federer, who raced into the interview room after his defeat, praised Del Potro, saying, "Juan Martin fought like a lion."
"I feel like the way I'm playing right now it's not good enough to win this tournament. It's better I'm out and somebody else gets a chance to win."
The ruined possible first-ever New York matchup between Federer and Nadal, which had been a focus headed into the match, was an afterthought to Federer in the wake of a comprehensive loss.
"Of course, it's a pity but Juan Martin deserves it more."
Federer made 41 unforced errors, nine more than his rival, and his 60 winners were 12 more than Del Potro, whose blistering serves took their toll.
"I served so good. I hit my forehands hard as I can. We play a great match and I deserve to win in the end," he said.
Del Potro, who has undergone four wrist surgeries since beating Federer eight years ago in the final, rescued four set points in the third set tie-breaker.
"I cannot believe to play another semi-final after all my injuries."
Federer was at a loss to explain his loss.
"It happens. I don't know. It's hard to explain sometimes," Federer said. "You do the right ythings and he does too and it matches up badly your way. I don't think I played badly. It didn't go my way."
As for the four squandered set points in the tie-breaker, Federer said, "I don't think those four points made all the difference. I missed too many balls.
Federer said in some ways he wasn't disappointed because he knew his game was weaker than it looked, having been aided by playing three rivals in a row who are a combined 0-40 against him.
It has been a tough tournament. I struggled," Federer said. "If I ran into a good guy I knew I was going to lose. And going in I knew I'm not in a safe place.
"I'm out of this tournament because I wasn't good enough in my mind, my body and my game.
Disclaimer: No Business Standard Journalist was involved in creation of this content
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
