He did fine with the slider when he is in slap mode -- which is a strange looking swing an much different from his power stroke. It is not just an adjustment with his wrists. I his case it is a hitch. My recollection is that U.N. also noticed it and found it odd. So, yes he can be successful with the slider if he is happy being a .280 slap hitter. if he is looking to hit for power, he will have trouble with the slider.