MILWAUKEE — Spencer Horwitz hit a three-run double and the Pittsburgh Pirates extended their dominance over the Brewers this season, beating Milwaukee 4-3 on Monday night in the opener of a four-game series. Pittsburgh has won six of seven games against the NL Central-leading Brewers this season. The Pirates jumped on Brewers starter Brandon Sproat (3-7) in the third. Stallings eventually struck out Gonzalez before walking Henry Davis and giving up a soft bunt single to Jake Mangum that scored Rodriguez. Pirates starter Bubba Chandler (4-8) held the Brewers without a hit until David Hamilton’s single up the middle with two outs in the fifth.