I remember watching the match of a 12-year-old girl who afterwards said she was very disappointed in her serving. I didn't think it was so bad, but she tried to convince me that she made 8 or 9 double faults.
Her father had taped the match, and after we watched it, she saw that she made only 2 double faults.
Things like this happen because powerful emotions magnify the disappointment into something horrible.
Reality gets completely distorted, and a there is danger that the player starts believing their own distorted perceptions, thus creating limiting beliefs... read more