After looking at Geraldo Perdomo\u2019s batting strengths, I wrote, \u201cGeraldo 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.\u201d \u2014 Makakilo<\/a><\/p>\n Then, I discovered the Squared-Up Explorer<\/a> in the FanGraphs Lab (it also looks at Launch angles).<\/p>\n Let\u2019s use the Explorer to look at squared-up and launch angles for Marte and Perdomo (games through 17 April).<\/p>\n For each pitch type, the metric to measure performance will be run value per 100 pitches found in Baseball Savant.<\/p>\n 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?<\/p>\n 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.<\/p>\n Marte does not appear to be in a slump for two reasons:<\/p>\n His 0.45 RBIs per game compares well to last season.His improved squared-up percentages for five types of pitches.<\/p>\n 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.<\/p>\n Four observations follow:<\/p>\n This season, Perdomo is hitting four-seam fastballs better (higher run value per 100 pitches) than last season. It makes sense that his squared-up percentages are better than last season.Although his squared-up percentages are better for changeups, his run value dropped slightly (although it\u2019s still positive). I\u2019m expecting his batting results against changeups will improve this season.For curves, it did not seem to make sense until I saw that only 17% of his batted balls were fly balls.Perdomo\u2019s table generally confirms that, for each type of pitch, squared-up percentages impact performance as measured in run value per 100 pitches.<\/p>\n Confirming that Perdomo is in a slump is his 0.2 RBIs per game, which is less than half of last season\u2019s rate. Improving his squared-up percentages could help him break out of his slump.<\/p>\n After considering the perspective that squared-up percentage is the key to improvement this season, you may want to compare it other perspectives.<\/p>\n Mike Hazen said Perdomo is working through his swing mechanics.<\/p>\n \u201cHe\u2019s having a great approach [at the plate]. It seems like he\u2019s gone through hitting the ball on the ground a lot to popping the ball up a little bit. I\u2019m sure he\u2019s working through some mechanical stuff.\u201d \u2014 Mike Hazen, April 2026<\/a><\/p>\n![\"\"](\"https:\/\/www.rawchili.com\/mlb\/wp-content\/uploads\/2026\/04\/PNG-Squared-Up-Marte-PNG.png\"\/)
<\/a>Marte improved last season\u2019s results for sinkers, curves, and cutters. For each of those pitch types, he improved his squared-up percentages.Marte\u2019s results against 4-seam fastballs is comparable to last season.<\/p>\n![\"\"](\"https:\/\/www.rawchili.com\/mlb\/wp-content\/uploads\/2026\/04\/PNG-Squared-Up-Perdomo-PNG.png\"\/)
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