PITTSBURGH >> Andrew McCutchen hit his 23rd home run of the season and the surging Pittsburgh Pirates downed the reeling Detroit Tigers 6-3 on Tuesday.Chad Kuhl (5-7) took a shutout into the sixth and allowed three runs and five hits to win his second straight start. Kuhl, who pitched six innings, had the first two RBIs of his big league career on a two-run single in the fourth off Matthew Boyd (5-6).