As anyone who follows this team closely can tell you, the bullpen has been a big problem this year allowing nine blown saves so far (tied for 4th in MLB). Here the stats for the key members of the bullpen:
Hendriks: 2.50 ERA | 2.51 xFIP | 93 %tile xwOBA
Bummer: 2.76 ERA | 2.87 xFIP | 88 %tile xwOBA
Heuer: 5.68 ERA | 3.00 xFIP | 47 %tile xwOBA
Crochet: 0.77 ERA | 4.33 xFIP | 77 %tile xwOBA
Marshall: 6.89 ERA | 5.67 xFIP | 46 %tile xwOBA
Foster: 6.39 ERA | 3.46 xFIP | 64 %tile xwOBA
Ruiz: 2.71 ERA | 3.91 xFIP | 47 %tile xwOBA
Kopech: 1.91 ERA | 2.85 xFIP | 96 %tile xwOBA
I think the takeaways are pretty clear here. While Hendriks & Bummer have blown a combined six saves and haven’t quite lived up to expectations, there is little reason to doubt they won’t be highly valuable relievers going forward. Beyond that, Kopech has been an absolute beast in a multi-inning reliever role but is a risk to switch to the rotation at some point. Finally, Crochet has put up a great ERA by limiting the quality of contact against him (.307 xwBACON), but his BB rate remains concerning and he isn’t going to maintain a 0.0 HR/9 rate all season. I still believe Katz is having Crochet hold back his stuff a bit, so if the velocity returns come October he can still be a post-season weapon.
The problem is basically all the other RH relievers and I’ll even include Ruiz in that bucket. His xFIP isn’t horrible, but he’s gotten very lucky based on the quality of contact against him, including a 51% hard hit in rate (4 %tile). No doubt he’s been the least of our problems out of this next group, but I doubt buy him being anything other than last man in the pen as he simply doesn’t strikeout enough batters. Statcast basically has Ruiz no different than Marshall & Heuer, just with vastly different results.
Heuer has been a huge disappointment as I was expecting big things from him. He has been roughed up pretty badly on his sinker this year (.429 wOBA), especially against LH hitters (all three HRs allowed have come against lefties). That being said, there is reason for optimism with him IMO. His BB rate has greatly improved from 2020 all while slightly improving his overall K rate. Zone charts suggest he’s left too many sinkers center cut and that’s something that should be correctable with time. He’s running a ridiculous .456 BABIP that will normalize over time. His changeup has also developed into a nice weapon against lefties, with a 55% whiff rate on much higher usage than last year. I think his splits against lefties will normalize by the end of the season and he can be a valuable 7th inning guy.
And now here is where the real problems come into play. Foster & Marshall were both keys to the bullpen last year and both guys have been utter disasters so far with 6.00+ ERAs. Statcast likes Foster better and I can see why. Excellent K & BB rates to go with very solid quality of contact against him. He’s been the victim of a flukey LOB rate (56%) and being left to die by his manager in Seattle. Since that infamous blowup, he’s pitched 10.1 innings with 13 K’s, 1 BB, 0.77 WHIP, 1.74 ERA, and a 3.41 xFIP (nearly identical to his full season figure). He’s not the 2.20 ERA guy we saw last year and he probably requires a quick hook when things aren’t going well, but I still think he can be a good 6th inning guy.
That leaves Marshall and good god has this dude failed to carry the load. Last year he put up a 2.58 xFIP and a 98 %tile xwOBA. He was legit elite and he was expected to compete with Heuer as the primary RH setup man this year. So what’s changed since 2020? Well first & foremost his K & whiff rates are down significantly, dropping from the high 80 %tiles to the low single digits. His whiff rate on his curveball in particular has dropped from 58.5% last year to 4.5% this year. That is absolutely bonkers and it’s even more surprising given his spin rates and movement are very similar to last year. I don’t know if the issue is location (more curves have been in the zone), him tipping his pitches, or scouting reports simply being out on him now, but the curve is no longer the weapon it once was. Furthermore, without the curveball being a threat, guys are sitting on his changeup and that pitch has taken a beating as a result. Honestly, I don’t know what to make of the guy, but I can confidently say this version of Marshall isn’t going to work and we can’t rely on him being an 8th inning option going forward.
So what does this all mean? Our #1 trade need on the pitching side has to be a high-end RH setup man. I think we’re fine from the left side, with Bummer owning the 8th, Crochet the 7th, and eventually Fry in the 6th. I think Heuer can handle the 7th on a championship team and I’m willing to stick with Foster in the 6th. There is a gaping hole in that 8th inning and that will need to be addressed, especially with the young arms in Charlotte off to rough starts. I’d give Marshall another month in low leverage situations to prove he can regain the form of his curveball, but if not, he’s probably a DFA candidate given his lack of options. Either way, we need a better setup man in place to move all the righties down a spot and so that Tony doesn’t feel compelled to use 6.00+ ERA guys in high leverage situations.