Through Bryce Harper's first 115 plate appearances, his OPS--a composite measure of a player's ability to get on base and hit for power--stood at .906, a high number by any standard. Harper is probably due to regress and struggle as the season wears on, but to give you a sense of how remarkable that figure is, only one 19-year old has ever finished a season with a higher OPS--Mel Ott with a .921 in 1928. Other players on that top-ten list include Ken Griffey Jr., Ty Cobb, and Mickey Mantle. Harper also has four home runs, a pedestrian-sounding number, to be sure, but if he hits two more, he'll join a very short list of players who hit at least six as 19-year olds. Other players on that list? Griffey, Robin Yount, Ott, Mantle.
It is May and still early to conclude that he is living up to his hype as a once-in-a-generation player, but thus far he is putting up numbers the likes of which the game has only ever seen a handful of times from a player his age.