Welcome to the upside down, where four Major League Baseball teams that made the playoffs in 2025 find themselves in last place heading into action Friday.

The postseason underachievers include the Boston Red Sox, Detroit Tigers and Seattle Mariners in the American League, along with the Chicago Cubs in the National League. Also off to a sluggish start are the reigning AL champion Toronto Blue Jays, who aren’t in last place but do have a -22 run differential.

The division races are subject to some volatility, given that we’re not quite two weeks into the regular-season schedule. The sample is small. But, as the saying goes: Just because you’re paranoid, it doesn’t mean they’re not out to get you. Some of these slacking teams have real reason to worry their disappointing starts have staying power.

Feelin’ Blue Jays

The Jays not only own the ugly run differential, but they already have some serious injuries to overcome. Even before Opening Day, right-handers José Berríos, Shane Bieber and Trey Yesavage were absent from the starting rotation. Yesavage is working his way back with optimism, but the other two bring lingering doubts. The Jays also lost Cody Ponce to knee surgery because of a sprained ACL.

Also: Catcher Alejandro Kirk broke his left thumb on a foul tip. Outfielder Addison Barger sprained his ankle. Great gosh almighty, it’s not even mid-April.

No, Cubs, No

The Cubs are set to receive good news Friday with the anticipated return of slugger Seiya Suzuki, who injured his knee on an awkward slide in the World Baseball Classic in March. Suzuki’s return should take some pressure off Pete Crow-Armstrong to break out of his early season slump (which actually goes back to August).

The Cubs have some serious pitching woes. Three-fifths of the starting rotation is on the shelf, though left-hander Justin Steele has started to face live hitters in his return from elbow surgery. Less-happy news includes recent injuries to left-hander Matthew Boyd (biceps strain) and season-ending UCL surgery for right-hander Cade Horton.

Tigers stuck in cage

The Tigers don’t have a lot of obvious reasons for concern, but their slump and collapse in 2025 wasn’t 100% logical either. This group can just get out of whack for a couple of weeks at a time. Overall, they haven’t played that badly so far, and come in with a -1 run differential. They’ve also only played three home games. The WBC business might have knocked Tarik Skubal off his ideal prep schedule.

Something to keep in mind for the long haul: Injuries have picked away at the Tigers pitching depth, with Justin Verlander joining Reese Olson and Troy Melton on the injured list.

Sawx need a good warshing

The Red Sox always seem to be looking for ways to disappoint. They have not played poor defense so far, so they got that going for ’em. Other than that, it’s spotty. He surely will start to hit soon, but whatever is going on with Roman Anthony’s throwing arm bears watching. It looks like the top of the rotation is starting to take shape with Garrett Crochet and Sonny Gray stepping forward, but Ranger Suárez and Brayan Bello have been disastrous.

They’re not scoring a lot of runs, they’re not hitting a lot of home runs (as many projected). Aroldis Chapman’s velocity is down (he is 38 years old, after all), and the bullpen depth looks shaky for either performance or injury reasons. The Red Sox looked like an oddly constructed team during Spring Training and now they have a disappointing record to reflect it.

Don’t get rattled, Seattle

The Mariners have the worst record and the fewest actual concerns of any of these teams. 

Cal Raleigh, Josh Naylor and Julio Rodrígez are all slumping, but it won’t last. They’re 1-5 in one-run games, a stat that’s sure to improve. They’re sixth in starting pitcher ERA, which is the expected strength of the team anyway. They’re also playing better defense than they did in ’25. They’re about to rattle off 20 wins in 28 games, or something.