[greymule]

I had Youkilis out yesterday and still have him out. From his position when this became a tag play, he moved at least 5 feet inward to avoid the tag.

The infield grass is just two feet inside the baseline

True, but irrelevant. If a runner is 3 feet to outfield side of the line and then moves 2 feet inside the line to avoid a tag, he's out of the base path. If Youkilis had started right on the direct line between 2B and 3B, then being on the grass would not have put him out of his base path.