Prior to contact Roddick 's hips turn 123 degrees from the take back to the trophy position , this brings his hips almost parallel to the baseline .
Andy 's front foot is placed 90 degrees to the baseline prior to beginning his action .
Prior to contact Andy 's hips turn 123 degrees from the take back to the trophy position , this brings Andy 's hips almost parallel to the baseline .
Andy 's front foot is placed 90 degrees to the baseline prior to beginning his action .