I've seen some that say MAYBE 3 or 4
But Sparky Anderson, who knew a few things about winning, had a few very quotes on the subject that I think are pretty accurate:
"Baseball is a simple game. If you have good players and if you keep them in the right frame of mind, then the manager is a success."
"I don't believe a manager ever won a pennant. Casey Stengel won all those pennants with the Yankees. How many did he win with the Boston Braves and Mets? I've never seen a team win a pennant without players. I think the only thing the manager has to do is keep things within certain boundaries."
"If a team is in a positive frame of mind, it will have a good attitude. If it has a good attitude, it will make a commitment to playing the game right. If it plays the game right, it will win—unless, of course, it doesn't have enough talent to win, and no manager can make goose-liver pate out of goose feathers, so why worry?"