Oscar grew up in Covina and graduated from Charter Oak High school in 2012. In 2010 helped his team make the Colt World Series in Indiana. Made varsity his sophomore year and played 3 years of varsity baseball as a pitcher. Made both Glendora Tournament All Tournament Team and 1st Team All Sierra League his junior year. After graduating from Charter Oak, he played at Lindenwood University in Missouri, a Division II school, as a pitcher. He is currently majoring in accounting.