I think one usage might be to create some forward momentum.

來源: Justme 於 2013-01-29 23:15:27 [] [舊帖] [給我悄悄話] 本文已被閱讀： 次 (170 bytes)
Murray steps forward for both 1st and 2nd serves. When the timing is right, it helps to take the ball early and reflect the power of the serving ball back to the server.
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