One of the my favorite bits in Mets discourse these days is that the only part of roster building that David Stearns is actually excited about is dumpster diving for relief arms. Signing a young superstar to a record-setting contract? Boring. Trading for a potentially electric center fielder or a very affordable #2 starter? Grunt work. Digging into NPB stats to pick out some minor league guys to invite to camp? There we go, that’s the good stuff.
Enter Mike Baumann (not to be confused with Michael Baumann the Fangraphs writer). A third round pick out of Jacksonville University in 2017, Baumann was never a top prospect not even a particularly notable one; even in the dog days of the Orioles rebuild, his stuff was never good enough to merit an extended chance in the rotation, nor was he very good out of the bullpen. The Orioles eventually cut him loose during the 2024 season, and he’d wind up bouncing between not one, not two, but four other teams before heading off to Japan for the 2025 season. After 15 mediocre innings with the Yakult Swallows (where he walked 7.2 batters per nine), he’s now back stateside on a minor league deal with an invite to camp.
What did the Mets see here? Well it’s definitely not the top-line performance as we just discussed, so it must be the underlying stuff. And indeed, all the public-facing stuff models have something positive to say about Baumann’s 2024 arsenal. His knuckle-curve was scored a 67 by PitchingBot (20-80 scale), a 118 by Stuff+ (100 is average), a 122 (100 is average) by Rob Orr’s metrics, and -1.1 by Baseball Prospectus’s StuffPro (negative is better). The movement profile isn’t amazing, but he throws it hard for a curve at 87.8 MPH. You can catch a couple shots of this pitch proving to be an effective put away offering in this 2024 compilation – watch out for the Miguel Sano jump scare at the start.
Baumann also has a fastball that’s consistently graded out as slightly above average (ignoring what I assume is a calibration or small sample size issue from PitchingBot in 2024), so you can see the potential building blocks. Maybe it’s a tweak to the fastball shape to make it a more effective offering and get Baumann two above average pitches. Maybe it’s an adjustment to his mix to focus more on the knuckle curve. Perhaps it’s a new third pitch or an improvement to his current slider or changeup that makes it all work better together. It could even be that some of this has already happened in Japan last year and we just can’t see it because we don’t have the data. There are a lot of different directions this could go.
Most minor league signings of this type never amount to much – a single appearance or three in the dog days of summer, or potentially only a couple of Spring Training outings before the club goes in a different direction. The success the Mets have had recently with pitching development is infectious though, as is David Stearns’ track record with building bullpens. You almost believe that everything they touch will turn to gold. Maybe that will be the case for Mike Baumann, providing him a respite from his professional odyssey and the Mets meme creators more fuel for their most reliable bit.
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