"Rizzo's really serious; I can never get him to smile," Eldredge said as Rizzo appeared over his left shoulder. "Is that a smile? Is that a smile, bro? C'mon."
Eldredge posted on Twitter that he was trying out for the Cubs on Friday, adding, "they say I've got the goods to be an all star."
MLB and all 30 teams participated in Snapchat Day on Friday.
Carrie Muskat is a reporter for MLB.com. She writes a blog, Muskat Ramblings. You can follow her on Twitter @CarrieMuskat and listen to her podcast. This story was not subject to the approval of Major League Baseball or its clubs.