The diminutive Duke (he stands 1.65 meters, or 5-foot-5) is known for his exceptional versatility. He is generally thought of as a stroker, either throwing the ball relatively straight or playing a hook shot from the extreme outside of the lane. But he has also shown the ability (especially earlier in his career) to swing the ball out toward the gutter and bring it back like a cranker when necessary. This gives him the advantage of being able to score well on most of the PBA's multiple oil patterns.