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July 4th was a great night for Twins fans, not just because of a win that involved all parts of the team, but in particular because Jorge Lopez made his return to the Twins. The outing itself wasn't anything to celebrate, and from a pure baseball standpoint, maybe the opposite, but on a much bigger scale, it was one of the best moments this season.
Those with experience with mental health struggles, whether your own or someone close, know the impact they can have on life. None of us knew the exact extent of what was happening, but it must have been challenging for things to come to the point of stepping away from his profession. I think this took tremendous courage from Lopez, and I'm happy he seems to have received the needed help and will continue to address his ongoing mental health issues.
Jorge Lopez made his return in blazing fashion. Although he only threw eight pitches, four were sinkers, averaging 97.8 MPH and topping out at 98.5 MPH. As stated before, the outing wasn't spectacular, as he allowed a run and only generated one swing-and-miss. Still, the return of his velocity was encouraging, especially since it declined dramatically right before his IL stint.
So why should we believe Lopez will turn things around? He was brilliant in April but faltered in May and June, and it seemed like his season was declining, as was his stuff. Two things make me optimistic about Jorge Lopez: pitch usage and Stuff+ numbers.
It was written about before on Twins Daily, but Jorge Lopez had been throwing an unusual amount of four-seam fastballs this season, 20.4% of his pitches after only using it 4.5% of the time last year. Hitters are currently hitting .438 with a .875 SLG against his four-seam fastball. While 89 pitches might seem too small of a sample for judgment, Lopez's four-seam has never performed well in any season. I think part of the successful transition to the bullpen was lowering the pitch's usage.
Lopez also significantly increased his slider usage from 10.7% in 2022 to 20.6% this year. While not as bad as his four-seamer, the pitch still hasn't garnered quality results. Of pitchers with at least ten plate appearances against the pitch, Lopez's slider ranks 272nd out of 358 pitchers in xwOBA at .345 and 236th out of 358 in whiff% at 29.2%. Not great.
However, Jorge Lopez's curveball in the same qualifier ranks 69th out of 198 pitchers in xwOBA at .252 and 28th out of 198 in whiff% at 41.4%. His curve has also generated a .203 xBA and .333 xSLG, in addition to its excellent swing and miss capability. Fewer four-seam fastballs and sliders with more sinkers and curveballs could help Lopez regain some form.
Even without adjusting his pitch distribution, I still believe in Jorge Lopez's improvement this season; as mentioned before, Lopez rates highly in Stuff+. If you are unfamiliar with Stuff+, it essentially measures the characteristics of a pitch, its speed, vertical and horizontal movement, release, spin rate/efficiency, etc. The league average for Stuff+ is 100. I will link an article by Owen McGrattan on Fangraphs that explains Stuff+ and how it can be used in more detail. It also details how stuff+ can be more predictive than standard metrics like ERA, K%-BB%, RA/9 and when a sample size becomes large enough to use.
Back to Lopez, among qualified relievers on Fangraphs, his 114 Stuff+ ranks tied for 47th out of 170 relievers. This doesn't guarantee above-league-average production from Lopez. Still, it certainly indicates that a very projectable metric has Lopez in a similar Stuff+ range as other elite relievers such as Devin Williams (118 Stuff+), Brusdar Graterol (116 Stuff+), and Michael King (113 Stuff+).
Stuff+ also helps explain why the Twins wanted to experiment with a four-seam fastball and slider. Lopez's four-seam grades at 106 Stuff+ better than his sinker at 103 Stuff+, and his slider grades at 138 Stuff+ higher than his curveball at 127 Stuff+. While current results have not been as hoped, the reasoning for trying makes sense.
I believe Lopez can conquer his struggles in Minnesota. He has shown the ability to overcome difficulties in his career and has just returned from maybe the biggest hurdle he'll face. More than just the numbers, Lopez has my support as a player and as a person. He has endured something that could have destroyed his career, and I am rooting for him regardless of how he pitches and for his career to be successful, even if not in a Twins uniform.







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