This article is part of our Spring Training Job Battles series.
Catcher: The Miguel Montero era is over in Arizona, and new GM Dave Stewart chose not to go out and spend on a proven replacement. Rather, the team has a mix of youngsters and veterans who will compete to fill both the starting job and the backup role. Tuffy Gosewisch, Peter O'Brien, non-roster invitees Blake Lalli, Gerald Laird, and Jordan Pacheco, and Rule 5 selection Oscar Hernandez are all candidates. Gosewisch's experience perhaps gives him the early edge, but his offensive limitations are well established at this point, and for fantasy purposes, the 24-year-old powerhouse O'Brien makes for the far more intriguing option. There are legitimate questions as to whether O'Brien will be able to stick behind the plate, but the Diamondbacks have said that they will continue to develop him as a catcher, and a strong showing in spring training could sway the front office to give him an early audition. An important caveat to keep in mind here is that the Diamondbacks must keep Hernandez, the top pick in this winter's Rule 5 draft, on the major league roster all year in order to retain him. Hernandez probably isn't ready for a regular role – he hasn't logged an at-bat above Low-A – but it's possible they could keep him as the top backup or as a third catcher and give him only occasional starts.
Third base: Make no mistake about it; the organization wants Yasmany Tomas to be their starting third baseman