Serbia's Novak Djokovic hits a return to Sam Querrey of the U.S. during their Davis Cup singles quarter-final match in Boise, Idaho, April 7, 2013 (Photo: Reuters)
Last year's runner-up picked up the injury when he led Serbia to a Davis Cup quarter-final win over the United States last week.
Djokovic practiced on Tuesday but did not put too much pressure on his right leg when serving.
He will face Russian Mikhail Youzhny in the second round on Wednesday.
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