Steve Karsay incorporated curves and splitters yesterday during his 12 minutes of throwing batting practice.
Karsay, who missed most of the past two seasons with shoulder trouble, has played catch or thrown off a mound every day since camp opened. ''I learned 2 1/2 weeks ago that if I take two days off in a row without doing anything, I’m in trouble,’' he said. ''I can’t take two days off without my arm feeling cranky.’' The Yankees can’t be counting on getting a full season out of Karsay, but if they’re fortunate, he might be good for 40-50 innings.