But their teams are still facing a weekend long battle to set-up that July duel after Kazakhstan and Japan fought back to level their respective ties yesterday.
World number one Djokovic showed no signs of the eye infection which brought his run of 17 successive finals to an end in Dubai last week as he brushed past Kazakhstan's Aleksandr Nedovyesov 6-1 6-2 6-3 in Belgrade.
Djokovic, who led Serbia to the 2010 title, required treatment on a left shoulder problem although it did not prevent him from securing an easy win over his 200th-ranked opponent.
"The shoulder is nothing and the eye infection is behind me so I am looking forward to playing the doubles on Saturday," said Djokovic.



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