"You all know Novak Djokovic as a world tennis champion," she said. "he is also a champion for children, passionate about his work in promoting the rights and best interests of children in Serbia."

“大家都知道，德约科维奇是世界网球冠军，”她说，“他也是儿童事业的倡导者，他对促进塞尔维亚儿童的权利和最佳利益充满热情。”

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Adding a former champion, and one of the best women's players of all time, means that fans will again get to witness some of the finest tennis in the world.

又是一位前世界冠军，一位史上最优秀的球员，意味着球迷们又能大饱眼福，见识更多优秀选手的惊艳风采。

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Nadal's opponent on this night was to be Argentina's Juan Martin del Potro, a former U.S. Open champion, the world No. 7, a gifted baseliner and hoverer in the tennis elite.

WSJ: Jason Gay: Nadal, Tennis's Snuffleupagus

Meanwhile, defending champion Roger Federer crashed out of the Rotterdam World Tennis tournament after suffering a shock 6-3 7-5 defeat by France's Julien Benneteau.

CNN: Serena back on top of the world