Andy Murray was unable to cap a strong week in the Middle East with a win as he lost the Mubadala World Tennis Championship final in straight sets to Andrey Rublev.
The Russian world number five won 6-4 7-6 (7-2) to secure the title at the exhibition event in Abu Dhabi.
Murray, 34, battled back in the second set, but faltered in the tie-break.
He had beaten fellow Briton Dan Evans and 20-time Grand Slam champion Rafael Nadal to reach the final.
Rublev controlled much of the first set and got the decisive break of serve in the fifth game.