'TDA' is the most important tip author Harvey Penick describes in his famous book The Little Red Book. I actually wrote the letter TDA on the left thumb of my golf glove. I remember Louie Oosthuizen drew a red dot in the same place on his glove during the 2010 Open Championship as a reminder to stay in the moment of the present shot. It did wonders for him. I'm hoping it will do the same for me.
