Major League Baseball recently announced that it will be adding nine new locations to the roster of ballparks that accept digital tickets stored and presented through Apple’s Passbook iOS app. It appears that MLB is following the overall push toward digital as digital ticketing services like those that were supported by passbook move further mainstream.

The 2013 season will see the Baltimore Orioles, Chicago Cubs, Detroit Tigers, Milwaukee Brewers, Minnesota Twins, Oakland Athletics and Pittsburgh Pirates join the San Francisco Giants, New York Mets, Boston Red Sox and Kansas City Royals in supporting Passbook tickets. As of right now, three more teams have signed on but aren’t ready to make an official announcement according to the MLB.

Baseball fans can use the free At Bat app in the App Store to purchase tickets and store them in Passbook until game day. The regular season is kicking off on Sunday, March 31 so users in respective locations can make their life easier going forward.

Source: GigaOm