SHANGHAI, China—Novak Djokovic’s victory celebration turned out to be more dangerous than his opponent.

Jubilant after overwhelming Russia’s Nikolay Davydenko 6-1, 7-5 in the Masters Cup final Sunday, Djokovic tossed just about everything in reach—two rackets, wristbands and his sweat-soaked shirt—into the cheering crowd at Qi Zhong stadium.

Then he headed to the players box, where his coach, family and a former Miss Universe were standing and cheering. A joyous group hug ensued, and they all bounced up and down together, reveling in the Serb’s first title in six months...

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