Literally, "controlled baseball."
If you're playing this way, it's by the numbers. The manager tells you precisely what to do, and you do it. There are algorithms for when to bunt, for when to throw a ball. And there is no room for surprise. It is ground out (not a pun), controlled and predictable.
Kanri yakyu will often get you into the playoffs. It rarely means you're going to win the big games, though.
The secret is being able to play this way when you need to, but being brave enough to leap when it's least expected. Just like your career.