Ahead of the match, Nadal had said he will need to raise his game to get past the red-hot Thiem, who reached his first US Open quarter-final when he defeated 2017 US Open runner-up Kevin Anderson in straight sets.
“He’s a fantastic player. He’s a very powerful player. He’s a great guy,” Nadal had told reporters.
Earlier, the world no.1 fought off resistance from Georgia’s Nikoloz Basilashvili with a 6-3, 6-3, 6-7(6), 6-4 win on Sunday to set up the quarterfinal against Thiem in New York.