British number one Andy Murray lost on his return to action yesterday after undergoing back surgery in September.
The 26-year-old, who was recently named BBC Sports Personality of the Year, lost 7-5 6-3 to Frenchman Jo-Wilfried Tsonga in the Mubadala World Tennis Championships in Abu Dhabi.
Murray has not played since Britain's Davis Cup World Group play-off win over Croatia in September.
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