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Even the defending champs have some questions that need answering.

The Chicago Cubs have as much talent as any team in baseball; however, the coaching staff needs to decide who will fill the final spots on the bench and in the bullpen.

If there's one area that could turn into a compelling position battle, it's the No. 5 starter spot. An injury-plagued veteran with major upside, a standout reliever and a top prospect-turned-reclamation project are among the options.

Then there's the matter of discussing a potential extension with All-Star starter Jake Arrieta.

With pitchers and catchers set to begin reporting in a matter of days, here's an in-depth look at the five key questions the Cubs will need to answer this spring.