Start a new "Road to the Show" career as a pitcher. Spend your stat points only on pitching. I also choose to be a left handed pitcher in the Pittsburgh Pirates organization, but lefty/righty and which team you pick shouldn't matter though. Set the difficulty to "Rookie". After that, just sim to your next career event each time, and manually play through each game or appearance. I picked up my five wins in a row three months into my first season in Double AA.