Sentence:  She stands just a little over 5-foot-6, but her two-handed ground strokes off both wings, inspired by the four-time Australian Open champion Monica Seles, allow her to create sharp angles and <WSD>counterpunching</WSD> power. 
Meaning of the word marked with <WSD> tags:  To deliver a competitive response to an opponent designed to exploit a weakness created by the opponent's offensive efforts.