interesting - of the playesr mentioned in the summary, a-rod, ott and kaline's 20/21 year old performance was pretty much the best of their career.

they may have had another year (or several) that were nearly comparable performance (either sligthly better or slightly worse) but they never improved.

in that contest, pjuols' 20/21 year old performance is even more 'wow!' - he's done better than it in a number of seasons. same with
teddy ballgame's career.

interesting - of the playesr mentioned in the summary, a-rod, ott and kaline's 20/21 year old performance was pretty much the best of their career.

they may have had another year (or several) that were nearly comparable performance (either sligthly better or slightly worse) but they never improved.

in that contest, pjuols' 20/21 year old performance is even more 'wow!' - he's done better than it in a number of seasons. same with
teddy ballgame's career.

Sure, but that's because Pujols and Ted performed a lot worse at 20 than A-Rod and Kaline did¹, so they could improve ;)

If Trout can keep this going, it almost goes without saying that he'll never have a significantly better year. As Rany/Joe point out, if Trout did put up the season he's on pace for at the age of 20, and then improved at a "normal" rate, he'd peak with the value of Babe Ruth if Ruth were simultaneously an everyday hitter and a rotation starter...

¹ According to WAR, so don't yell at me.