Story highlights Novak Djokovic answers late call to help Serbia to Davis Cup victory over Croatia

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(CNN) Novak Djokovic led Serbia to the quarterfinals of the Davis Cup World Group after answering a late call to play in Saturday's last 16 doubles victory over neighbor and rival Croatia.

Teammate Viktor Troicki had been due to play in the doubles rubber alongside Nenad Zimonjic, but a draining five-set singles match with Croatian teen starlet Borna Coric on Friday convinced Serbia coach Bogdan Obradovic to draft in the fresher Djokovic.

It was an inspired choice.

The Serbian pair took less than two hours to defeat Franko Skugor and Marin Draganja 6-3, 6-4, 6-1, securing an unassailable 3-0 aggregate lead in the best of five tie after singles wins for Djokovic and Troicki over their Croatian opponents Friday.

"We wanted to finish the job today, to take advantage of the fact that we won the first singles and that was done," Djokovic said in quotes carried by the AFP news agency after the match.

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