Giants 7, Royals 1: Madison Bumgarner continued his strong postseason by allowing one run in seven innings as visiting San Francisco routed Kansas City in the opening game of the World Series.

Hunter Pence hit a two-run homer and Pablo Sandoval also drove in two runs for the Giants, who set the tone with three runs and five hits in the first inning against Royals starter James Shields (1-1). Gregor Blanco, Michael Morse and Joe Panik also had RBIs for San Francisco, which looks to take a 2-0 lead Wednesday after halting Kansas City’s eight-game postseason winning streak.

Bumgarner (3-1) struck out five and gave up three hits and one walk in his fifth consecutive strong outing this postseason. The left-hander allowed a homer to Salvador Perez with two outs in the seventh to end his postseason record of consecutive scoreless innings on the road at 33 1/3 frames.

San Francisco started strongly and pushed across the first run on a double to right by Sandoval. Buster Posey was thrown out at the plate on the play but any dent in the momentum was avoided as Pence, who reached base four times, followed with a blast to center to make it 3-0.

Morse had a run-scoring single in the fourth and Blanco drew a bases-loaded walk off Danny Duffy later in the inning to make it 5-0. Panik had an RBI triple in the seventh and scored on Sandoval’s single before Perez homered in the bottom of the frame.

GAME NOTEBOOK: Bumgarner had pitched 21 2/3 career scoreless innings in World Series play until serving up Perez’s homer. … Shields allowed five runs and seven hits in three-plus innings to raise his postseason ERA to 7.11. … Pence’s homer was his first of the postseason.