Juan Martin Del Potro was beaten by Nikoloz Basilashvili in the China Open final on Sunday.
Tournament top seed Del Potro lost 4-6 4-6 to Basilashvili, who had eliminated Britain's Kyle Edmund in Saturday's semi-final.
Del Potro was not moving fluidly throughout and he ceded a break quickly to fall 1-2 behind to the world No 34.
Basilashvili, in the second set, was forced to battle to hold his serve for 4-4. Del Potro threw the kitchen sink at him but, when three break points came to nothing, his race appeared to have been run.
Basilashvili broke in the very next game then served out the match to win his second career title, having won the German Open earlier this year.
Del Potro has qualified for the Nitto ATP Finals in London, which are live on Sky Sports, after his run in China.
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There is live coverage of the Shanghai Masters throughout the week while we will also have coverage of the ATP Finals in November with every match live on Sky Sports.