World number one Novak Djokovic smashed his racquet and tore his shirt as he lost 6-4 6-4 to Roberto Bautista Agut in the Shanghai Masters semi-finals.
The Serb, 29, was further incensed at getting a time violation when changing his shirt, raising the point forcefully with umpire Carlos Bernardes.
"He was the star of the show," he said. "That's what he wanted to be today.
"But there are definitely things that I need to regain from the emotional, mental point of view."
Djokovic, who has won the event three times and was aiming to reach his 10th final of the season, said exhaustion may have played a part in his mood during the match.