The odds of Castillo getting a 57 game hit streak get better with every game he extends the streak. I now estimate he as about a 1 in 143 chance of breaking the record, based on his batting stats this season. It makes sense. He needs a 24 game hit streak, and those haven't been all that rare lately.

Update: Based on his career batting numbers, the odds of Castillo breaking the record are 1 in about 2080. The question is, which stats do you think represent the real Luis Castillo?