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Jack Martin

Reporter · US

Indexed articles, last 90 days
20
Latest publication
Sep 25, 2026
Outlet visibility, for RotoGraphs Fantasy Baseball
Top 1M sites
Earliest in this view
Jul 6, 2026

Latest articles

  1. Article · Sep 25, 2026 · Jack Martin

    Freddy Peralta: A Lost Season that Was Saved (opens the original)

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    Entering his contract year, Freddy Peralta was one of the biggest offseason moves, coming to the Mets from Milwaukee as a top-20 starting pitcher in fantasy ADP. For Peralta, the Mets, and anyone who drafted New York’s prospective ace this season, 2026 is a year that has not gone as planned. But following a fresh start in Florida, it seems as if Peralta is back on track, at least for now. We will look at this rollercoaster season for Freddy Peralta, what this means for his fantasy value in 2027,

  2. Article · Sep 21, 2026 · Jack Martin

    Stance Shifters: Part 2 (opens the original)

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    Using Statcast data, we can track which of the four aspects of a hitter’s batting stance moved and by how much across each month of the season. In this piece, I wanted to go a step further with some of the names from part one and layer in bat tracking data and batted ball tendencies to see whether the stance changes translated into a measurable swing change. He has one of the highest tinkering scores, which has come primarily from opening his angle month-on-month. From a relatively neutral 10 de

  3. Article · Sep 17, 2026 · Jack Martin

    Stance Shifters (opens the original)

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    Over the course of a 162-game season, many casual fans may be surprised by how much a hitter might adjust their stance and setup. Often, the assumption is that once any athlete reaches the pinnacle of their sport, there is resistance to change, particularly mid-season, and any major mechanical changes are reserved for the off-season. But it turns out hitters are constantly tinkering with parts of their stance, particularly when looking to find some form. Now with Statcast’s batting stance visual

  4. Article · Sep 10, 2026 · Jack Martin

    xwOBA Split Matchups for the Fantasy Playoffs (opens the original)

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    As we move on to the final stages of this fantasy season, one more splits chart could be beneficial for those looking for streaming options in a playoff run. This chart plots xwOBA vs left-handed pitching (LHP) and right-handed pitching (RHP) on each axis, with filter options for which teams to target depending on their split, with the biggest gap differentials also included. This is done using handedness split data since the break, which now has a big enough sample in its own right while captur

  5. Article · Sep 8, 2026 · Jack Martin

    Cutters and Command (opens the original)

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    OpenCommand, introduced by Doyoung-Tom Kim, is an absolutely incredible open-source dataset that offers a new way to track pitch locations based on target-miss distance, how far a pitch landed from where the pitcher was actually trying to put it, estimated from the catcher’s setup and camera tracking. Without going too much into detail about the workings of OpenCommand, I would highly recommend checking out his work and the great lengths he went to account for camera angles, plate depth, etc. Th

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