Re: Having trouble sparring shorter opponent
stick that jab out in his face to obstruct his vision and always keep circling. Watching Augie Sanchez vs Floyd Mayweather Jr (amatuers) is a good example of how you fight a shorter opponent.
Also, if he manages to come near you and have you against the ropes, you could always clinch him tightly to prevent him from working on the inside where you will be at the disadvantage.
in short, footwork + jab