There's clearly no white smudge on his chest protector before the ball gets there, and then there's an obvious spot after the ball is pulled off. Seems to me that the ball was probably gunked up by the Cecil. That, or Yadi has some serious stickum on his chest protector, to the point that pulling the ball off ripped up some of the external layer with it. The more I think about this the less likely it seems that this was some sort of insanely unlikely fluke, which is what I categorized it as upon my first, cursory view of the play. To be fair, even if the ball was tampered with AND the chest protector was coated, that play would be pretty flukey. But if I had to wager, I'd bet that Cecil was doctoring the ball a bit.