Andy Gruenebaum was the star for much of the game, but he couldn't prevent the Chicago midfielder from winning the match in the 83rd minute.
After a dull first half, the match came to life in the second period, and it was the home side in the ascendency. Were it not for a string of spectacular saves by Andy Gruenebaum, the Fire could have easily been three or four goals to the good.
Instead, the game was settled late off a long throw in. Austin Berry got a flicked header on Jalil Anibaba's long throw, and Larentowicz knifed in between two defenders to head home, giving his side a narrow victory.
After going winless in their first five, the Fire have now won two of three.