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One year ago Wednesday, I wrote about Javier Assad's pitch mix, as he tried to establish himself as a multi-inning (but fairly high-leverage) relief weapon for the Cubs. Specifically, I recommended that he lean considerably harder on his sinker and slider against right-handed batters, and on his four-seamer and changeup against left-handed ones. He was, at the time, a kitchen-sink guy, and it didn't seem likely to be a sustainably successful approach.
In one sense, I was demonstrably wrong. For the second year in a row, Assad was effective, despite less-than-dominant peripheral numbers. He entered 2024 with nearly 150 innings of big-league work under his belt, and a 3.06 ERA, despite a more pedestrian 4.34 FIP. His six-pitch mix--four-seamer, sinker, changeup, cutter, slider, curve--doesn't include any superior weapons, but he found ways to defy the regression monster all the way through his first full season.
To really keep that monster at bay, though, a player has to be proactive about adjustments. If you wait until the league figures you out to start making changes, you'll fall behind in the constant battle for an advantage. Thus, although we have to be careful not to extrapolate too much from a single (frigid) game's worth of data compiled against the execrable Rockies, it's worth taking note of some big changes Assad made in his 2024 debut Tuesday night.
Firstly, his pitch mix was drastically different. Here's how Assad's pitch usage broke down by handedness in 2023.
| Batter Hand | BF | P | 4Seam% | Sink2Seam% | Cutter% | Slider% | Curve% | Change% |
| Righty | 274 | 1012 | 11.40% | 40.40% | 22.50% | 25.00% | 0.70% | 0.00% |
| Lefty | 239 | 948 | 30.00% | 17.90% | 32.00% | 0.60% | 10.80% | 8.80% |
Here's the same breakdown for Tuesday's 89-pitch effort.
| Batter Hand | BF | P | 4Seam% | Sink2Seam% | Cutter% | Slider% | Curve% | Change% |
| Righty | 12 | 45 | 4.40% | 42.20% | 8.90% | 42.20% | 2.20% | 0.00% |
| Lefty | 10 | 44 | 50.00% | 13.60% | 18.20% | 2.30% | 4.50% | 11.40% |
This version of Assad is essentially the one I proposed last year, but as a starter. He went pretty much right after lefties with his fastball, and he dramatically increased his slider usage against righties, each at the expense of the cutter. It led to six scoreless innings in which he allowed just six baserunners and struck out five. Again, this is the Rockies, and it was a miserable night for baseball--especially if you were a hitter. We can't assume that what worked Tuesday will work going forward.
Still, this is a significant development. Going away from a kitchen-sink approach doesn't have to mean giving up the advantages Assad gleaned from his previous style. He can pitch with touch and feel even within this framework. To wit, if you cut his four-seamer samples for each of his three big-league seasons in half based on their horizontal movement, and then examine the movement patterns, he was getting more rising action on the half of his heaters that cut more (i,e., effectively creating a cut-ride look) last night than he had in either previous campaign: 17.5 inches of induced vertical break, compared to 16.0 inches in 2022 and 2023. He got a couple of called strikes in the up-and-away quadrant of the zone to lefties Tuesday, with the pitch virtually acting as a harder backdoor cutter, with less chance of a mistake in the heart of the zone.
Assad also seems to have tweaked his slider, in addition to throwing it more often. The sample is too small to assume this will hold, but the slider had two more inches of sweep and a bit more depth Tuesday night than it had in 2022 and 2023. When you consider that it was also playing off more sinkers (as opposed to the cutter), that adjustment means hitters really have to feel like they're covering a plate about two feet wide. Miguel Amaya did well to steal Assad a couple of called strikes at the low, outside corner of the zone, making things even tougher on the helpless Colorado hitters.
I don't believe Assad can pitch to an ERA just over 3.00 again this year. If he's able to persist with these changes in pitch mix and movement using his excellent pitchability, though, I do think he can stay on the low side of 4.00. That would be a huge development for the Cubs, since they need him more acutely than expected in the early going. We're going to see at least another handful of Assad starts, and perhaps several more than that. We'll have plenty of chances to suss out how real his transformation is, but given what we've seen so far, it's fair to be a bit more optimistic than we expected to be.
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