Rizzo launched a 2-2 pitch from George Kontos to left-center, and the ball hit the padding that rims the top of the front of the bleachers at Wrigley Field. Rizzo broke into his home run trot before realizing the umpires had not signaled home run. He turned on the jets and made it safely to third.
The umpires then reviewed the play and gave Rizzo a home run, his first since Aug. 5.
One of the Iowa fans in town for a college football game tried to help by framing the area on the padding where the ball hit with his hands.
Carrie Muskat is a reporter for MLB.com. She writes a blog, Muskat Ramblings, and you can follow her on Twitter @CarrieMuskat. This story was not subject to the approval of Major League Baseball or its clubs.