Be ready when it's your turn. When others are hitting, that's when to figure out the yardages and select your club. Have another ball in your pocket in case you hit one in the water.
Be honest and let your play do the talking
Don't be a sandbagger. "I guess everything is going right today!" "I swear I never play this well." Those are standard lines for guys who lie. Your body language will give it away. No client will ever trust you.
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But don't be the Vanity Handicapper, either. When you make a double bogey don't say, "I swear I birdie this hole every time!" Don't talk about how great a golfer you are. If you are good, they will notice.
How to dress
This is very underrated. You should look good on any occasion. If you look like a pro, the other members will notice you and will make your host feel important. If you look like crap, the other members might think you are there on some work release program.
Check the club's dress code about shorts but never, ever wear cargo shorts.
Color coordinate your outfit but don't overdo it and pull a Rickie Fowler and go all one color — you'll wind up looking like a crayon. And limit it to three colors. You don't want to look like you're going to a Grateful Dead concert. Who would trust their money to THAT guy?
If you have hair, wear a visor with a cool logo like St. Andrews or Mercedes. They are way cooler than wearing a hat that says, "Kiss the cook" or "World's Coolest Dad." If you're bald, don't forget the sunscreen.
My picks for the Masters
You can take the guy out of Wall Street, but you can't take Wall Street out of the guy. Here are my odds on favorites for the green jacket.