Some years ago, former U.S. Secretary of Defense Donald Rumsfeld spoke a now infamous quote, and it's hard not to think about it when discussing the early weeks of a baseball season:

"There are known knowns; there are things we know that we know.

"There are known unknowns; that is to say, there are things that we now know we don't know.

"But there are also unknown unknowns — there are things we do not know we don't know."

Here's what we know about the Tigers:

Justin Verlander and the rest of rotation will be a strength, even if there have been a few hiccups near the back with Rick Porcello.

Austin Jackson, Torii Hunter, Miguel Cabrera and Prince Fielder make for one of the most impressive top halves of a batting order in the game.

The bullpen has problems: Octavio Dotel has struggled. Brayan Villarreal hasn't been all that good, either. Phil Coke struggles with right-handers. Joaquin Benoit may not be a closer, after all.

Here's what we know we don't know:

Who, if anyone, will right the ship in the bottom half of the lineup, and what positions will be the greatest need when the trade deadline arrives in July?

It's easy to say "the bullpen!" but July 31 is 14 weeks away. A lot of things can happen during that period of time.