These are the Top 10 rookie classes since 1947

The 2018 rookie class doesn’t quite rank as historic — at least by one measure. Going by FanGraphs’ wins above replacement (WAR) metric, this year’s group accounts for 9.6 percent of the value accrued by all MLB players. That ranks 13th among all seasons since 1947, when baseball first integrated and the Rookie of the Year Award became an official national award handed out by the Baseball Writers’ Association of America (BBWAA).