JUPITER, Fla. -- At the midway point of Spring Training, the Marlins have some tough decisions to make as they trim their roster. With Opening Day on March 28, MLB.com breaks down each position and predicts which 25 players will head to Miami to get the season started against the Rockies at Marlins Park.

Catcher (2): Jorge Alfaro, Bryan Holaday

What’s changed? Some nagging injuries have created uncertainty behind the plate. Alfaro, if healthy, will be the everyday catcher for what the organization hopes is several years. First, he has to be healthy. On Feb. 23, the Marlins' first Grapefruit League game, Alfaro bruised his right knee, and aggravated it on Tuesday. Chad Wallach, who is on the 40-man roster, has missed some time with a right quad strain. That opens the door for Holaday, a non-roster invitee who was with the team last year.

First base (2): Neil Walker, Martin Prado

What changed? Walker, a switch-hitter, and Prado, who has missed substantial time the past two years due to injuries, are expected to split time at first. A free-agent pickup, Walker has spent the majority of his career at second base, but he’s making the switch to first base. Walker also has been hitting in the middle of the order -- often third -- in spring games.

Second base (1): Starlin Castro

What changed? A mainstay on a youthful squad, Castro has emerged as a leader and mentor to many of the young players, including second-base prospect Isan Diaz. In the final year of his contract, Castro projects to hit in the middle of the lineup, perhaps third, and if he starts off hot, he could increase his trade value before the non-waiver Trade Deadline.

Third base (1): Brian Anderson

What changed? Arguably the new face of the franchise, Anderson is moving back to third base after appearing last year in more games in right field than at his natural position at the hot corner. From the start of Spring Training, the Marlins made it clear that Anderson will be their regular third baseman. He played in 91 games in right field last year, and 71 at third. Because of Anderson’s emergence, Prado will now be an option at first base and third.

Shortstop (2): Miguel Rojas, JT Riddle

What changed? Miami is in an interesting spot with two shortstop options, and the club is comfortable with either one. Unless one steps up and outright wins the job, playing time could be close to evenly divided. Rojas has had the better Spring Training thus far, but performance the next three weeks will more directly determine who gets the nod when the season begins. Riddle is a left-handed hitter who is more of a pure shortstop. Rojas can play all four infield spots.

Outfield (4): Lewis Brinson, Peter O’Brien, Curtis Granderson, Rosell Herrera.

What changed? O’Brien is getting every opportunity to play right field, where the Marlins are eager to see if he can tap into his power potential. Brinson has shown plenty of promise in Spring Training. Granderson, a non-roster invitee, is expected to make the club and play left field. Herrera is a utility player who switch-hits and can play all three outfield positions as well as shortstop.

Starting pitchers (5): Jose Urena, Dan Straily, Wei-Yin Chen, Sandy Alcantara, Trevor Richards.

What’s changed? Urena has already been announced as the Opening Day starter. The Marlins are open to dealing Straily, but if he stays, he likely will be the No. 2 starter. Chen may wind up in the bullpen if he doesn’t show consistency. Along with Alcantara and Richards, right-hander Pablo Lopez is primed to be in the rotation. Lefty Caleb Smith, returning from lat surgery, is building up gradually.

Relief pitchers (8): Drew Steckenrider, Sergio Romo, Adam Conley, Tayron Guerrero, Riley Ferrell, Jarlin Garcia, Austin Brice, Jeff Brigham

What changed? Romo signed as a free agent, and is an option to pitch in every inning. He could at times be an opener (sparingly) or close. Steckenrider is considered a favorite to close, but the team plans to go more by matchups than one set option. Conley and Garcia are two lefties, and Brice, a right-hander with a good sinker, is an option to face left-handed hitters.

A more simple breakdown of the revised roster is:

**Catchers
**Jorge Alfaro
Bryan Holaday

**Infielders
**Neil Walker
Starlin Castro
Miguel Rojas
Brian Anderson
JT Riddle
Martin Prado

**Outfielders
**Lewis Brinson
Peter O’Brien
Curtis Granderson

**Utility player
**Rosell Herrera

**Rotation
**Jose Urena
Dan Straily
Wei-Yin Chen
Sandy Alcantara
Trevor Richards

**Bullpen
**Drew Steckenrider
Adam Conley
Sergio Romo
Tayron Guerrero
Austin Brice
Jarlin Garcia
Jeff Brigham
Riley Ferrell