Headley wasn't available Tuesday due to a sore back, The Westchester Journal News reports. Gregorio Petit got the start at third, but after suffering an injury of his own, the Yankees elected to put Alex Rodriguez in as his replacement rather than Headley. It doesn't appear to be anything more than a minor issue, and Headley appears set to return to the lineup for Wednesday's game, but it could be a situation worth monitoring if he's held out again.