Because these are always fun, I'll predict my Opening Day 25-man roster way early:

C- Travis d'Arnaud, Anthony Recker
1B- Ike Davis, Josh Satin
2B- Daniel Murphy
SS- Ruben Tejada
3B- David Wright
Utility IF- Anthony Seratelli
OF- Curtis Granderson, Eric Young Jr., Chris Young, Juan Lagares, Andrew Brown
SP- Jon Niese, Bartolo Colon, Zack Wheeler, Dillon Gee, Dice-K
MR- Vic Black, Jeurys Familia, Carlos Torres, Scott Rice, John Lannan, Jose Valverde
CL- Bobby Parnell

Alternative Possibilities:
- If Ike is hurt, Lucas Duda. If Ike is healthy, Duda to AAA. Unless one of Ike/Duda are traded
- Omar Quintanilla could take Seratelli's role as backup IF
- One of Dice-K or Jenrry Mejia will be the #5, I'll lean Dice-K to start the year because they've talked up having a veteran in the rotation.
- One of Valverde or Kyle Farnsworth will probably be the last reliever. I'll lean Valverde to start the year because he's apparently been mentoring young guys and he has a higher base salary if he makes the team, so the Mets probably have more hope for him.