Nate Schierholtz homered off former teammate Sergio Romo with one out in the ninth inning to lift the Chicago Cubs to a 1-0 win over the San Francisco Giants on Saturday night.
Dropped to sixth in the Cubs' order after batting cleanup a night earlier in the club's first game after trading Alfonso Soriano.
Schierholtz worked a full count off Romo (3-6) before hitting a towering blast into the right field stands to hand Romo his second blown save in as many games.
Starlin Castro added two hits for Chicago, which is 18-13 in its last 31 games.
Pedro Strop (1-0) pitched one inning for the win and Kevin Gregg worked the ninth for his 21st save to complete the five-hitter.
Madison Bumgarner pitched eight shutout innings for San Francisco, who have lost six of seven and are a season-high 11 games under .500.