Morning Mound Visit: sabermetrics news - 5/7/19

FanGraphs | Jay Jaffe: Luis Castillo of the Reds is finally breaking out. After fits and starts, and now a changeup that induces whiffs and groundballs, he could become one of the most effective pitchers in the league.

Baseball Prospectus | Craig Goldstein ($): Braves general manager Alex Anthopoulos responded to the criticism regarding stagnating payroll despite higher revenue, and his response was that they in fact promised “flexibility,” something that in a shrinking free agent looks more like self-imposed austerity.

Bill James Online | Mark Simon: DRS results are in for the first month-plus of the season, and they shouldn’t be too surprising: Lorenzo Cain and Mike Trout lead the pack, followed by Cody Bellinger (more surprising) and Nick Ahmed.