Molina, acquired from the Toronto Blue Jays in the RP Sergio Santos trade, has ranked as one of the White Sox's top prospects since joining the organization. He will make his major league debut after having dominated minor league hitting, striking out 25 batters while walking only 5 through his 6 minor league starts.
Petricka, another top White Sox prospect, has struggled to keep runners from scoring through the early part of the 2012 season, but has still managed to build a 24-to-12 strikeout-to-walk ratio through his 5 Triple-A starts.
For more on the Chicago White Sox, be sure to drop by the White Sox blog South Side Sox or head over to Minor League Ball for an in-depth look at the MLB's top prospects. And stay current with news from around the league at Baseball Nation with Rob Neyer.