Arroyo was placed back in the Giants' Thursday lineup after Eduardo Nunez (hamstring) was scratched, Andrew Baggarly of The San Jose Mercury News reports.
Arroyo was originally given a break to help him clear his head during a slump, but Nunez's hamstring injury continues to bug him, so Arroyo's day off is cut short. He'll square up against the Cubs' Eddie Butler to try to right his season (.196/.248/.313 in 121 plate appearances).