This spring, many analysts predicted that this year's best rookies would likely consist of a group of position players that included Boston Red Sox shortstop Xander Bogaerts, St. Louis Cardinals outfielder Oscar Taveras, Pittsburgh Pirates outfielder Gregory Polanco and Chicago Cubs second baseman Javier Baez and possibly a top pitching prospect -- the Arizona Diamondbacks' Archie Bradley, Colorado Rockies' Jonathan Gray or Seattle Mariners' Taijuan Walker -- or two.
Many of those players have surfaced and played a factor, but none of them reach the top 10 in our rookie rankings. The top of this year’s rookie rankings is anchored by a certain slugging Cuban import, with emerging youngsters and another import (Masahiro Tanaka) to follow. Certainly those aforementioned prospects still could end up being the best long-term players of the class. In fact, I'm sure at least a few of them will be. But they haven't been the best in their rookie seasons.
As we head down the stretch and into the final five weeks of the season, here's my ranking of the 10 best rookies in baseball: