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Morning Mound Visit: sabermetrics news - 7/26/18

Below replacement-level first basemen; future free agent classes; xwOBA matching wOBA

Houston Astros v Colorado Rockies Photo by Justin Edmonds/Getty Images

FanGraphs | Jay Jaffe: There are a few teams with first basemen under replacement level, and it’s been a pretty weak position overall this year. The Rockies, Mariners, Yankees, Astros, and Phillies are all getting negative value from the position so far.

The Ringer | Zach Kram: Even if the 2018-19 free agent class isn’t going to be the slam-dunk we thought it would be, there are still players farther in the future that will change free agency—JD Martinez, Paul Goldschmidt, Chris Sale, and Nolan Arenado will likely all get their own respective mega-deals.

Tangotiger Blog | Tom Tango: Why don’t xwOBA and OBA match each other on Baseball Savant? The way that Tango will make this so is by using a one-year rolling period to make sure they match up, which will be implemented by the end of this year.