個人感覺，發球必須體力充沛才能打好。先發球者如果雙方沒有破發，總是在換場休息後再發球，因此有點優勢。

來源: happybob 於 2017-12-02 04:59:13 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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