Blue Jays SP Marco Estrada is generally regarded to have one of the best changeups in all of baseball. Here is an article talking about how good it is, and how it's the key to all his success
Marco Estrada Has Maybe the Changiest Chaneup
In game, his changeup is rated as a 60, and overall, he's rated in the 240-280th area for chaneup rating. That's something i hope can be looked at.