Why pro's struggle on match day?

[armstm]

i read somewhere you're not supposed to block out negative thoughts - it doesn't work. rather you accept that the thought happened, thank the chimp part of your brain for warning you of the dangers of missing the shot and reassure the chimp that it's not the end of the world if you do.

Well off to a match this afternoon with a friend at his place. He is a very good player with a high break of 121. See if I can get some positive thinking and visualize my shots and block out the negative thinking and doubt of every shot. I have a big qualifier tomorrow and need to win some games.