Spring Training is notoriously unreliable for predicting the future. Let’s face it, if you’re not optimistic on Opening Day, it’s probably your attitude -- and not your team -- that needs some adjustment.

On the other hand, if you walk into a clubhouse and the first three lockers belong to Max Scherzer, Patrick Corbin and Stephen Strasburg, you get why everyone is so optimistic.

But if you’re in a clubhouse when the general manager sounds like a third-year med student, it’s OK to have some doubts. And all of that is a prelude to a discussion of six teams -- three I’m extremely bullish on and three I’ve got some questions about.

Three that I like:

Nationals

Selling points: How much time do you have? First, there’s a rotation with a front three -- Scherzer, Corbin, Strasburg -- as good as any in the league. Third baseman Anthony Rendon is going to put together MVP numbers. As long as Rendon and first baseman Ryan Zimmerman are healthy, the offense is going to be as good as any. General manager Mike Rizzo did a tremendous job upgrading the bullpen. Second baseman Brian Dozier’s addition to the infield is going to solidify a defense that has a chance to be spectacularly good.

Questions: Outfielders Juan Soto and Victor Robles are critical to the Nationals' success in 2019, and they’re two of the best young players anywhere. But there are things we can’t know because Robles is 21 and Soto is 20, and between them, they’ve played 150 big league games. Also, neither Zimmerman nor Adam Eaton played 100 games in 2018.

Cardinals

Selling points: New first baseman Paul Goldschmidt changes the lineup in all sorts of ways, all of them good. The Cardinals have as impressive a collection of young power arms as anyone, and none of them is more impressive than right-hander Jack Flaherty. Outfielder Dexter Fowler seems poised for a bounce-back season, and if he doesn’t have it, Tyler O’Neill has had a great spring. Manager Mike Shildt won the trust of his players and the respect of fans in near world-record time after taking over for Mike Matheny last summer.

Questions: Two huge question marks could be critical for the Cardinals. Ace Carlos Martinez has missed most of the spring with a weak throwing shoulder, and there’s no way of knowing how much he can contribute, or at what level. Likewise, righty Alex Reyes is working his way back from Tommy John surgery.

Rays

Selling points: The Rays have upgraded all over the diamond since winning 90 games in 2018. This should be Tampa Bay’s best offensive team in recent seasons, and the pitching depth is deep and good with a flush farm system poised to provide even more. Few managers have done a better job than Kevin Cash.

Questions: The unknown is how the Rays' young players will handle last season’s success and how a team depending on so many kids will hold up over a long season.

Three that I’ve got questions about:

Yankees

Selling points: The Yankees will score plenty of runs and protect leads. Even with Dellin Betances out, the bullpen has the chance to be one of the best ever. Aaron Judge and Giancarlo Stanton seem poised to have monster seasons, and shortstop Troy Tulowitzki has passed every test. Masahiro Tanaka, James Paxton and J.A. Happ form a solid front three until Luis Severino and CC Sabathia return.

Questions: The Yankees hope that Severino can return in May, but until he does, that’s a huge hole in the team. Right-hander Domingo German has looked good this spring, but it’s hard to imagine the Yankees winning a World Series without Severino near his best.

Indians

Selling points: No rotation is better than this one. If the Indians can just get to October, they’ve got the kind of starting pitching that can carry a team to a championship. Third baseman Jose Ramirez is one of the three best offensive players in the American League, and shortstop Francisco Lindor has been breathtakingly good.

Questions: Is there enough offense? The Indians are still scrambling to add to theirs with Opening Day approaching. That could mean that Ramirez and Lindor, along with new first baseman Jake Bauers and designated hitter Carlos Santana, are going to have to be ridiculously good. If the Twins have improved, the AL Central could be more interesting than most people think.

Phillies

Selling points: Bryce Harper plays for the Phillies. So do J.T. Realmuto, Andrew McCutchen and Jean Segura. Those four additions have reshaped a bad offensive team, and in the case of Harper’s signing, have fans convinced that this new era of Phillies baseball will be a great ride. David Robertson’s arrival improves the bullpen, and the rotation was plenty good already.

Questions: How quickly will everyone become comfortable with everyone else? If Harper gets off to a bad start, there will be a whirlwind of negative attention. Does the rotation need one additional quality arm (nice to meet you, Dallas Keuchel)?