the most important direct awareness is of the position and motion of the hand. not from visual cue but from nerve sensation. the position, angle and distance of the racquet head is acquired or learned awareness. clear understanding of a biomechanically sound swing path and placing a moving ball in that path at the precise spot where the racquet face angle is perfect for intended trajectory and spin of the ball is key to tennis stroke and skill. that's about it but that's what's difficult.
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