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Ketel Marte has improved his squared-up percentages for several pitch types this season, indicating he is not in a slump. In contrast, Geraldo Perdomo is struggling with a lower RBI rate and needs to enhance his squared-up percentages to improve his performance.
The following question inspired me. It was from the Snake Pit Roundtable. “One thing that isn’t is Ketel Marte and Geraldo Perdomo. What do they need to change to get the bats woken up?” — Blake Stokes After looking at Geraldo Perdomo’s batting strengths, I wrote, “Geraldo Perdomo is doing nearly everything excellently. Perhaps if he could improve his launch angle sweet spot percentage, that would allow him to sustain his breakout from last season.” — Makakilo *Then, I discovered the Squared-Up Explorer in the FanGraphs Lab (it also looks at Launch angles).* Let’s use the Explorer to look at squared-up and launch angles for Marte and Perdomo (games through 17 April).
For each pitch type, the metric to measure performance will be run value per 100 pitches found in Baseball Savant. This season for Marte and Perdomo, the question to address (for each pitch type) is when fly ball squared-up percentage improved (for all pitches, and for batted balls near the ideal launch angle) did their performance improve? Likewise, when they worsened, did performance worsen?
The following table looks at his squared-up percentages for each type of pitch (both all pitches and for those at ideal launch angles). Also, it looks at the run value per 100 pitches as the performance metric. Two observations follow:
Ketel Marte has improved his squared-up percentages for sinkers, curves, and cutters, showing better performance compared to last season.
Geraldo Perdomo is in a slump due to a low RBI rate of 0.2 per game, which is less than half of his performance from last season.
Squared-up percentage impacts performance as measured in run value per 100 pitches, with higher squared-up percentages generally leading to better batting results.
Geraldo Perdomo needs to improve his squared-up percentages and address his swing mechanics to enhance his batting performance.

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The following table looks at his squared-up percentages for each type of pitch (both all pitches and for those at ideal launch angles). Also, it looks at the run value per 100 pitches as the performance metric.
After considering the perspective that squared-up percentage is the key to improvement this season, you may want to compare it other perspectives. Mike Hazen said Perdomo is working through his swing mechanics. “He’s having a great approach [at the plate]. It seems like he’s gone through hitting the ball on the ground a lot to popping the ball up a little bit. I’m sure he’s working through some mechanical stuff.” — Mike Hazen, April 2026 Ben Seigel’s AZ Snake Pit article explains possible reasons for Perdomo batting:
Comparing performance to last season, changes in squared-up percentages seemed to have an impact on run value per 100 pitches. Marte improved last season’s results for sinkers, curves, and cutters. For each of those pitch types, he improved his squared- up percentages. Despite the inspiring round table question, he does not appear to be in a slump. Perdomo is hitting 4-seam fastballs better than last season. Nevertheless, his batting appears to be in a slump. Improving his squared-up percentages could help him break out of his slump.