The first part of a sound golf swing is a sound grip with your left hand, since it is with your left hand that you first grasp the club. The position of the left hand should be the same whether you use an interlocking, overlapping or a baseball grip. There is a correct way and an incorrect way to hold the club in your left hand. Many golfers prefer to hold it in the fingers of their left hand. However, I grip the club in my palm as much as possible. Try this test; rest a club against your fingers. It all feels pretty weak, doesn't it? Now rest the same club in your palm. Feels pretty firm, doesn't it? By holding the club in your palm you have complete control throughout the swing and thus can make a more solid swing and a stronger hit. As far as I am concerned, there is no other way to grip the club with your left hand.