Firefighters responded to a cinder-block storage room at 5:10 a.m. after reports of light smoke coming from the structure. The fire was declared a knockdown by 5:17 a.m.
It was the same storage room where a fire broke out during Saturday night's game against the Florida Marlins. Firefighters say that fire was caused by paper products igniting.
Firefighters are trying to figure out if Monday's fire is related to Saturday's fire or if there was a new source.
No injuries were reported in either fires.