The following 40-man roster players have less than five years service time and are out of minor league options. That means they must clear waivers before being sent to the minors, so the team would be at risk of losing them in attempting to do so. I've included players on multiyear deals. This list was compiled through MLBTR's sources. Next, we'll take a look at the NL West.
With the Diamondbacks beginning their season on March 22nd in Australia against the Dodgers, both teams will deal with a unique set of roster rules, as outlined by MLB.com's Steve Gilbert last month.
Delgado seems slated for Arizona's bullpen, unless perhaps Bronson Arroyo's bulging disk lands him on the DL. Regarding Tuiasosopo, D'Backs manager Kirk Gibson told Bob McManaman of the Arizona Republic yesterday, "He definitely could be a guy that comes into play for us because of his versatility."
The D'Backs took Mateo from the Cubs in December's Rule 5 draft, but with Brad Ziegler, J.J. Putz, David Hernandez, Addison Reed, Josh Collmenter, and Joe Thatcher seemingly locked in, there won't be room for Mateo if Delgado joins the pen. A trade or injury could create a spot. A trade with the Cubs to retain Mateo's rights wouldn't make much sense, as the D'Backs would still have to pass him through waivers to get him to Triple-A.
Elbert is on the 60-day DL currently, so he won't be occupying a roster spot. Guerra is "up against it" in trying to make a Dodgers bullpen stacked with veterans, as explained by MLB.com's Ken Gurnick last month. Tim Federowicz is set to back up A.J. Ellis behind the plate, so the Dodgers will probably have to try to pass Butera through waivers.
Yesterday, Matt Kawahara of The Sacramento Bee suggested there are two openings in the Giants' bullpen, assuming Petit makes the group as a long man. Machi will probably take one, but it could be tough for Huff to make the team in a similar role to Petit. Heath Hembree, Derek Law, and Jose De Paula are just a few of the other names in the mix.
There won't be room for both Adrianza and Abreu, as explained by Grant Brisbee of McCovey Chronicles. It seems likely one of them will be traded.
Unless the Padres decide to carry three catchers, Rivera's shot at making the team depends on Yasmani Grandal's recovery from July knee surgery.