Drink water - healthy brain and body

DNA - get out of the way

your body knows how to play tennis not your intellect
occupy your mind with "observing"  (no criticizing)
use "bounce - hit" to get back in an observing mode

Look like a winner

keep your cool
good posture and body language
adjust your strings with your head up (between points)

Develop a game plan starting in the warmup

identify their weakness
identify your strengths

Implement your game plan

play to their weaknesses
use your strengths
keep to the plan if it's working
change your plan if it's not working
   move, watch, consistency, placement, power

Play the ball not the person

Positive self talk

visualize the "cure" not the "problem"

Play 1 point, 1 ball at a time

each shot is a chance to be on track
the next shot is more important than the last mistake

Call lines graciously - on your side only or against yourself

be 100% sure the ball is out
call or signal "out" clearly and quickly