Andrew McCutcheon had two hits, including a two-run homer, pinch-hitter Matt Joyce had a key two-run single, and the Pittsburgh Pirates rallied from a four-run deficit to complete a three-game sweep of the freefalling San Francisco Giants with a 6-5 victory on Wednesday. The Pirates won their fourth straight game and sixth in seven. The Giants, who on Tuesday fell out of first place in the NL West for the first time in 97 days, lost their fourth straight.