Any top performer plays his very best when he or she is fully aligned at all levels of consciousness; this allows them to get into the state of 'flow'. At this high level of competition, any slight doubt of any kind can be enough to sink the ship, as it were. I recall one sprinter saying that if you were going to compete against Linford Christe, if you had any slight doubt even for a second in the week before the race, then you had already lost. In NLP language, that's a lack of alignment at the unconscious level. And yet, it's quite easy to put right.
Of course, the old-fashioned way is to keep going until you get a break and your mind suddenly fully realises that you really ARE a winner; rather like appeared to happen for Roger Federer after his first Wimbledon win. But that's a risky strategy. I think that's what never happened for Tim Henman. Agassi transformed his approach as a result of NLP coaching.
For any of us, the real difference that makes the difference as to whether or not we get what we are truly capable of in life, is about unconscious mis-alignment. Simply put, we have either unrecognised doubts or competing desires which undermine our focus and determination. It's totally fixable these days.