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Morning Mound Visit: sabermetrics news - 8/22/19

Rafael Devers’ explosion; how to fix Trevor Rosenthal; the Machado/Harper deals so far

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MLB: Detroit Tigers at Los Angeles Angels Richard Mackson-USA TODAY Sports

FanGraphs | Jay Jaffe: A lot has gone wrong for the Red Sox, but not Rafael Devers. When you combine a top prospect pedigree with a better two-strike approach, hitting to the opposite field at Fenway Park, and hitting the ball in the air, the result is a five-win player and one of the best third basemen in the game.

Baseball Prospectus | Ben Carsley ($): Trevor Rosenthal has had a trainwreck of a season, where his stuff has been fine but where he has essentially walked three times as many batters as he has struck. The key for a team like the Yankees, or anyone, to fix him is to get him to throw strikes.

The Athletic | Eno Sarris ($): People are already grumbling about the Manny Machado and Bryce Harper deals, but they are definitely working out so far. The Phillies and the Padres have two of the youngest position player cores in baseball, and it’s very difficult to get a young player like those for just money without sacrificing from your farm system.