When the Yankees take the field to play the White Sox at Yankee Stadium tonight, Adam Warren will take to the mound to throw his first official major league pitch as he makes his big league debut. Filling in for C.C. Sabathia after the Yankees’ ace was placed on the disabled list with a groin strain on Wednesday, the rookie is going to have some, um, big shoes to fill right from the get go. And while Warren might only be slated to get a couple of starts while Sabathia rests up as of now, a good performance could earn him an extended stay in the Bronx, either in a long relief role or in Andy Pettitte‘s rotation spot. If you read Tamar’s farm reports or follow prospect reports at all, you’re probably familiar with Warren by now, but if not, here’s a rundown of what to expect from the rookie.