The Pittsburgh Pirates had their sights set on NL Central-leading St. Louis before the Chicago Cubs forced them to concentrate on the rear view mirror. After dropping three of four against the Cubs this week to put their lead in the wild-card race in a precarious position, the Pirates now have to deal with a pair of Cy Young candidates in the first two of a three-game series against the Los Angeles Dodgers. With Zack Greinke on the mound for the Dodgers in Friday night's opener, Pittsburgh begins the Herculean task of getting this make-or-break 10-game trip off to a good start.