Rafa Nadal failed to reach a final for only the second time during his incredible 2013 season after being blown off court by Argentine whirlwind Juan Martin Del Potro at the Shanghai Masters on Saturday.
The Spaniard had been hoping to celebrate his return to the top of the world rankings this week by setting up a final showdown for the second time in as many weeks with chief rival Novak Djokovic.
But Nadal, one of the fastest athletes on the tour, found himself outpaced 6-2 6-4 after a breathtaking semi-final display of power and touch by the 2009 U.S. Open champion.
Serb Djokovic continued his love affair with the hard courts of China as he swotted aside the challenge of Jo-Wilfried Tsonga 6-2 7-5.
The defending champion stretched his unbeaten run in China to 19 matches by overcoming Frenchman Tsonga.
Del Potro's 1.98-metre frame usually prevents him from threatening Nadal's unshakeable ability to run the ball down at every corner of the court and the Spaniard's 8-3 head-to-head record before the semi-final bore testament to that.
On Saturday though Del Potro barely allowed Nadal, winner of 10 titles this year, a chance as he raced into a 4-0 lead in the first set before bagging it with a scorching ace.
Nadal thought he had broken for the first time to level at 2-2 in the second but Hawkeye disagreed and from then on the world's best player was chasing shadows as Del Potro produced one of the best performances of his career.
The Spaniard fired a service return long on match point to leave a jubilant Del Potro leaping high into the air in celebration.
The result condemned French and U.S. Open champion Nadal to his earliest defeat since a shock first-round exit from Wimbledon in June, the only other time this year he failed to reach the final of an event he had featured in.
Del Potro's first win over Nadal since 2009 also handed him a place in the season-ending World Tour Finals.
The Argentine became the fifth player to qualify for next month's elite eight-man tournament in London but four spots are still up for grabs as Wimbledon champion Andy Murray has ruled himself out following back surgery.
Nadal, Djokovic and David Ferrer are the other confirmed participants.