Manuel said he has been careful to play Davis, especially when he's struggling.
"You have to be careful when you make the choice for him, Manuel said. "You don't want to keep him down a path of not having success."
Manuel said former Mets first baseman Carlos Delgado used to enjoy facing lefties because it would help him get out of a slump. But with young players it's different.
"If they're on a downward spiral, you want to stop that as much as you can," Manuel said. "If he's going good, you want him to face a lefty. He might get a couple of hits or he might take an 0-for, but it's not detrimental to his success for long term."