Unlike offensive metrics, there isn't one truly reliable way to measure the defensive efficiency of MLB players.
But the league is getting close.
Four and a half years ago, Bartolo Colon vanished.
By Paul Roumeliotis
This isn't your older brother's Major League Baseball. Not anymore.
Gone are the days in the late 1990s and early 2000s where players seemingly broke some home-run record every season.