Hypnosis ??!!
Do a search for "Athletes who use hypnosis" or something similar. If you're wondering why the word "hypnosis" appears here, next to Mindset Wins and Attitude of a Champion and Peak Performance, consider that perhaps the athletes and teams you found in your search know something about winning. In other words, they all use it because it gives them what they need!
Hollywood and stage hypnotists have done a great disservice to legitimate hypnosis by conflating it with "mind control". They work hard to create the illusion that the hypnotist takes control of their client's mind. Not so - in fact, hypnosis for athletes actually gives the athlete more control over himself or herself. Most issues that athletes deal with (self-confidence, negative thoughts, lack of focus, etc.) are rooted in emotions. Emotions are rooted in the unconscious mind and hypnosis is the way to align the unconscious mind with conscious goals.
Hypnotherapy is something different - hypnotherapy is like any other clinical therapy - it's used to deal with psychiatric issues. Sports performance that can be improved upon is is simply not a psychiatric issue.