The confidence appeared to be draining out of the five-time champion, while Serena continued to serve faultlessly, taking her tally of ACES to 12 and opening up a 5-2 lead.

五次温网冠军的信心正在丧失，而塞雷娜的发球依然完美无缺，将Ace数改写为12个并取得5 - 2的领先。

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Additional probability computations for cards and coins (e.g. "2 or 3 aces")

更多卡片和硬币概率计算问题

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Still, Murray could never break free today. He let Ferrer off the hook at 3-1 and 4-2 in the second set, and he needed two ACES to save himself at 4-3.

他比费雷尔更具侵略性，但他今天仍不能化破发为优势，这也导致第二盘比分从3 - 1到4 - 2,4 - 3时他用两个ACE保发，最后靠费雷尔的急躁拿下比赛。

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His attacking style had given Murray problems from the start and, after saving four break points in game two, he broke serve in the following game and moved impressively to 5-2 with six aces and 20 winners.

BBC: Stanislas Wawrinka beats Andy Murray at US Open

Top-seeded Petrova hit seven aces in beating Zheng Jie of China 6-2 6-3 in the third round in Florida.

BBC: SPORT | Tennis | Petrova and Williams both advance

And Andy Roddick took less than an hour to dispatch Juan Carlos Ferrero 6-2 6-4, serving 18 aces and conceding just 11 points on serve.

BBC: SPORT | Tennis | Nadal struggles to win in Dubai