Velocity decreases
When it comes to velocity drops, I'm more willing to give the benefit doubt this year than normal given the shortened spring training. It's possible some guys just didn't have a chance to get fully up to speed, and I've seen some beat writers speculate that this is the point in the spring calendar where a lot of pitchers are working through dead arm as they ramp up. Add in that the weather is colder and you can definitely give guys the benefit of the doubt.
With that in mind, here are the pitchers whose average fastball velocity is down at least 1.5 mph from last season:
There are some big names there! Ray pitched well despite the lower velocity, though he also struggled with walks, which is always a concern with him. His success last year was tied to his fastball becoming a more effective pitch, which allowed him to challenge hitters in the zone more often. Can he pull off the same trick if this velocity drop sticks? Bad things tend to happen for Ray when he's issuing too many walks, given his issues with the long ball.
Similarly, Bieber tends to get hit pretty hard when he does tend to get hit, so his velocity dip is especially disconcerting. He'll still be able to rely on his excellent breaking balls for whiffs even if the fastball velocity is down, but if he's throwing in the low 90s, that could make his already middling fastball even worse. And, in Bieber's case, his velocity was already down the last time we saw him late in 2021 as he was coming back from a shoulder injury. If that is still an issue after an entire offseason, that would be a big red flag.
Ultimately, as I said, I'm willing to give guys the benefit of the doubt with early velocity dips. However, that doesn't mean I'm willing to overlook them entirely. For instance, if Bieber is still averaging around 90 mph with his fastball three starts from now, I'll be very concerned; ditto for Ray at 92. It's not that neither can be effective at that level, but it makes it a lot harder to pull off. The margin for error is simply slimmer with less velocity, and that's true for nearly all pitchers.