Walker pinch-hit Friday and struck out with the bases loaded and two outs in the sixth inning in the Pirates' 7-4 loss. It was his first game since Aug. 26.
Walker is hitting .280 with 14 homers and 69 RBIs. He rejoins a struggling Pirates lineup that has lost seven straight and averaged just over three runs per game in their last 13. Pittsburgh has only won twice in that span.
Outfielder Travis Snider is also back in the starting lineup. He has gone hitless in four pinch-hit appearances since missing four games because of an injured hamstring.