关键词： 轮询系统；混合式服务；穷尽式服务；限定式服务； 平均运行周期 [gap=1014]Key words: polling system; mixed serve; exhausted serve; limited service; mean period
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Djokovic was the slower out of the blocks and looked exhausted after the lengthy first point of the match, hinting at an ankle problem after dropping serve straight away.
BBC: Rafael Nadal wins US Open to seal career Grand Slam
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