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Morning Mound Visit: sabermetrics news - 9/14/18

Citi Field’s strange park factors; WARP positional adjustment mysteries; deflated Philly bats

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MLB: Washington Nationals at Philadelphia Phillies Bill Streicher-USA TODAY Sports

FanGraphs | Jeff Sullivan: From 2012-18, Citi Field has been the biggest run suppressor in baseball. Why is that? Suppressing home runs could make sense, but BABIP for ground balls, for example? That doesn’t make a ton of sense. So I suppose something to keep in mind for Jacob deGrom’s candidacy is that he also plays in the friendliest park in baseball.

Baseball Prospectus | Russell A. Carleton ($): Carleton has been obsessing over positional adjustments for WAR(P) and especially as it pertains to replacement players, so he digs into the mystery of why fourth outfielder-center fielders are so bad at defense, and why replacement shortstops are not good at second base (both have implications for WAR, like where the latter would just tack on a positional run value).

The Athletic | Eno Sarris ($): The Phillies have significantly under-performed their offensive projections, and the only player to take a real step forward was Maikel Franco. Their plate discipline has gotten worse, and they’re hitting fewer balls hard. It’s a bad combination, and it’s why they won’t win the NL East this year.