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Nate Roper

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MLB analysis using advanced metrics and data 📊 Pitcher Breakdowns | Player trends | Team strategy ⚾️

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Since Ryan Zeferjahn joined the Cubs, he's lost 1.3" of vertical break on his 4-Seamer, and slug against it has risen by .433 in August compared to last month. Why is this happening? No idea! No noticeable difference in grip, release position, velocity, or even raw spin rate. I wonder if the differences in barometric pressure, air density, or elevation between Angel Stadium and Wrigley are hurting the shape (pure guess, would love to hear others' thoughts). Or it's just natural fluctuation of the shape and this is an overreaction to small samples :)

Since Ryan Zeferjahn joined the Cubs, he's lost 1.3" of vertical break on his 4-Seamer, and slug against it has risen by .433 in August compared to last month. Why is this happening? No idea! No noticeable difference in grip, release position, velocity, or even raw spin rate. I wonder if the differences in barometric pressure, air density, or elevation between Angel Stadium and Wrigley are hurting the shape (pure guess, would love to hear others' thoughts). Or it's just natural fluctuation of the shape and this is an overreaction to small samples :)

68,708 görüntüleme

Jonah Tong has a BRAND NEW Cutter! The cutter plays closely off his fastball, at 15" iVB and -1.1" HB at 92 MPH. He leaned on it heavily today, almost 40% usage. It failed to generate a whiff and surrendered a home run and single.

Jonah Tong has a BRAND NEW Cutter! The cutter plays closely off his fastball, at 15" iVB and -1.1" HB at 92 MPH. He leaned on it heavily today, almost 40% usage. It failed to generate a whiff and surrendered a home run and single.

264,681 görüntüleme

Kane Kepley since his promotion to Double-A: .904 OPS .240 ISO 18.2% BB 15.2% K 150 wRC+ Kepley is racking up XBHs and is walking more than he strikes out. Extremely impressive approach so far!

Kane Kepley since his promotion to Double-A: .904 OPS .240 ISO 18.2% BB 15.2% K 150 wRC+ Kepley is racking up XBHs and is walking more than he strikes out. Extremely impressive approach so far!

10,326 görüntüleme

Ryan Sloan should be a top three pitching prospect in baseball. Sloan wields electric stuff at just 20 years old, paired with high-level command and strike-throwing. Today, he struck out one in one clean inning of work, going 1-2-3 against MLB hitters.

Ryan Sloan should be a top three pitching prospect in baseball. Sloan wields electric stuff at just 20 years old, paired with high-level command and strike-throwing. Today, he struck out one in one clean inning of work, going 1-2-3 against MLB hitters.

48,461 görüntüleme

Wei-En Lin (ATH) flashes advanced stuff for his age (just 20 years old), averaging 93.4 MPH on his heater yesterday, paired with a good approach angle and slightly above average extension. Lin pounds the zone and displays strong command, though he did surrender a few hits yesterday against CHW.

Wei-En Lin (ATH) flashes advanced stuff for his age (just 20 years old), averaging 93.4 MPH on his heater yesterday, paired with a good approach angle and slightly above average extension. Lin pounds the zone and displays strong command, though he did surrender a few hits yesterday against CHW.

17,889 görüntüleme

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