BOSTON (AP) — Mitch Keller struck out seven, Carlos Santana homered and Bryan Reynolds knocked in his seventh run of the season as the Pittsburgh Pirates completed a three-game sweep of the Red Sox with a 4-1 win Wednesday. Ke’Bryan Hayes drove in a run with a perfectly-placed bunt in the sixth and Santana added an RBI double during a two-run seventh that put the Pirates up 4-0. Pittsburgh improved to 4-2 on a cold, gray and blustery afternoon at Fenway Park, where the game-time temperature was 41 degrees. The Red Sox fell to 2-4.