Heyward delivers in 9th, 13th to lead Cubs over Giants 3-2

Jason Heyward stands at first base after hitting a game-winning single in the 13th inning. (John J. Kim / Chicago Tribune)

Jason Heyward stands at first base after hitting a game-winning single in the 13th inning. (John J. Kim / Chicago Tribune)

CHICAGO — Jason Heyward tied it with a single in the ninth inning and his liner to left-center in the 13th won it as the Chicago Cubs beat the San Francisco Giants 3-2 on Sunday to take three of four games in a possible playoff preview.

Anthony Rizzo led off the 13th with a single off Matt Reynolds (0-1) and went to second on Ben Zobrist’s sacrifice. Addison Russell, who had three hits, was walked intentionally before Heyward drove in his third run of the game.

Trevor Cahill (4-4) worked a perfect inning in a series in which all four games were decided by one run.

The Cubs were staring at a second straight loss when Russell led off the ninth with a double against Santiago Casilla. He went to third on a wild pitch and scored on Heyward’s single up the middle to hand Casilla his seventh blown save.