We all know the story. Castro was called up early in the 2010 season, at the age of 20. He exploded with a monster first game (a triple, a HR, and 6 RBI), and carried that to a very successful rookie season (.300 avg, 100 OPS+). He then followed that up with an even better season as a sophomore (.307 avg, 111 OPS+), continuing his hit rate while sprinkling in a bit more power. The sky was the limit for this kid. A 3,000-hit career seemed like a real possibility for him, given his age and hot start (300+ hits before turning 22).
But even then, folks were preaching caution. He had horrible plate discipline, and that could become a problem for him over time. Folks even reference Garry Templeton as an example of a young SS who arrived at 20, succeeded wildly early in his career, but quickly fizzled in his mid/late-20s.
Well, here we are in year 4 of the Castro era. He followed up his second year with a down year (.283 avg, 101 OPS+). Still a promising young player, but the dropoff in average (for a player whose best attribute was his ability to get lots of base hits) was notable. And this year, Castro has had an atrocious start to the season. He's hitting just .243 (OPS+ of 87). His K's are up, his power is down.
Are we seeing the beginning of a Templeton-like career? Or is he going to be able to figure things out and return to the bright young all-star caliber play we saw in 2010 and 2011?