The problem I have with "Heart" is that it is thrown around too frivolously. It's usually qualifing why a player, who isn't that talented, is allowed to play. Players like Vlad, Pujols, Cabrera, and Dunn aren't usually considered "hard workers", but are great players. Usually, the Brady Clarks, David Ecksteins, Doug Mientkiewiczs, Darin Erstads, Henry Blancos of the world, get labeled "hard workers" with a lot of "heart". I do believe heart exists, I just don't think, as others have pointed out, that it plays that much of a role in Baseball. Most things in baseball can be quantified, and if a player takes plays off, stats will show us those things. Until someone can show how "heart" effects the game, I just can't see it being that important. You're going to honestly tell me that Grieve didn't have the talent to dive after any of those balls that dropped 3 feet in front of him while he was slowly jogging towards it? Yes, and he wasn't slowly jogging...he is slow.