Novak Djokovic suffered a shock defeat in the Srpska Open quarter-finals with a straight sets loss against Dusan Lajovic.

It was the first time that world number one Djokovic had lost to a fellow Serbian since Janko Tipsarevic beat him 11 years ago.

Djokovic, who admitted during his pre-tournament press conference that he had been battling an elbow issue, lost 6-4 7-6 at Banja Luka in Bosnia.

For Lajovic, it was only his third career victory against a player in the top five of the world rankings.

It was Djokovicā€™s third defeat of the season, with the Madrid Open his next scheduled tournament, starting later this month.

ā€œI am overwhelmed, it is the biggest win of my career,ā€ Lajovic said in his on-court interview, reported by www.atptour.com.

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ā€œThe emotions are very mixed because Iā€™m playing here in front of the home town and Iā€™m also playing against a good friend and heā€™s a hero of our country.

ā€œBeating him, itā€™s something that I didnā€™t even think was going to be possible, but it happened.

ā€œHis percentage of the first serve was not the greatest, so I was able to use that to my advantage. But overall, I think it was very good tennis from my side.ā€