Orioles minor league report: Now in Triple-A, Jackson Holliday to join Bryce Harper, Ronald Acuña Jr. on exclusive list

Before they became stars in the big leagues, Bryce Harper, Ronald Acuña Jr., Vladimir Guerrero Jr. and Ozzie Albies did what Orioles prospect Jackson Holliday is about to do: reach Triple-A in their age-19 season and total at least 20 plate appearances.