Steven Matz is not ready to come off the disabled list, and the Mets have scratched him from his scheduled start Thursday night against Miami. The rookie left-hander, sidelined with tightness in his pitching shoulder, says he felt discomfort while playing catch Monday. New York manager Terry Collins says Jacob deGrom will be moved up a day to start for Matz in the finale of a four-game series between NL wild-card contenders. In other injury news, New York second baseman Neil Walker remained out of the lineup Tuesday for the third consecutive game with a stiff back. The Pirates sent outfielder Tito Polo and left-hander Stephen Tarpley to the Yankees to complete the Aug.