Although Japan provided stiff opposition for the reigning champions, a direct penalty kick conceived by Maria Caldentey from a hand ball by Hisui Haza ultimately gave Spain a fairly comfortable victory.
As is so often the case, Japan struck at the opening minutes in the first half with several attempts by skipper Ruka Norimatsu culminating Japans circuit on the pitch but Spain backliners could not allow Japan forwards through as both teams went off for break at nil all.
In the second half, Japan played a stunning one touch footy game gaining control and possession as Spain slipped into frustration mood causing several fouls and giving away a number of corner kicks.
Frustration then turned to desperation in the 79th minute of the second half when Maria Caldentey of Spain smashed a direct penalty behind the net.
Caldentey strapped up herself to beat Japans goal keeper Chika Hirao with a fierce strike off her boots through the corner.
Japan tried to regroup in the slick of the remaining minutes but failed to equalize as they went down 1-0.
Spain now looks to lead the group after both were leveled at three points in the opening matches.