Rookie hitters went deep nine times over 28 postseason games in 2007 and eight times in 32 games last year.
Schwarber's shot to left-center field was his second home run of the postseason, as he also went deep in the Cubs' NL Wild Card Game win over the Pirates on Wednesday night at PNC Park.
"He took a changeup and hit it to the opposite field," Cubs manager Joe Maddon said.