sentences:  The Cubs promoted Vitters and fellow prospect Brett Jackson from the Iowa Cubs of the Class AAA Pacific Coast League on August 5, 2012.He made his Major League debut later that day as a pinch hitter in the seventh inning against the Los Angeles Dodgers  On August 7, 2012, Vitters' was pinch hitting for pitcher Jeff Beliveau and made his first MLB hit for a double against the San Diego Padres in the seventh inning, scoring both Steve Clevenger and Darwin Barney.His first major league home run was on August 20, 2012 in the fifth inning against Mark Rogers of the Milwaukee Brewers.