Masterson was hit hard in the first game of a double-header with the Cubs Saturday, lasting just 4.1 innings and giving up five runs on six hits and a walk while striking out five. Three of the six hits were home runs as Masterson's struggles continue since being acquired in late-July. His spot in the rotation is definitely in jeopardy at this point and with Marco Gonzales pitching well Saturday night, and Michael Wacha nearing a return, it's possible he may have made his last start of the season for the Cardinals.