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Gallardo works by having 3 pitches that look the same. A fastball that swerves armside (2-Seamer @91mph: +9 Vert., -5 Horiz.) straight fastball (4-Seamer @92mph: +11 Vert, -1.5 Horiz.), and a a fastball that swerves gloveside (Slider @89mph: +5 Vert., +2.5 Horiz. - though I think he's got a Cutter that runs 90mph: +6 Vert., +1 Horiz. and a Slider that runs 86mph/+4V/+3H that get confused for eachother always). Notice the pretty clear pitch tunnel shared between the 3 pitches. They spin at 210, 190, and 160 degrees and spin within 50 RPM of eachother, it's gotta be next to impossible for a batter to guess which pitch he's seeing when they're all working properly, which would explain the bad swings on dead centered pitches.