![dpa) - German tennis player Thomas Haas hits the ball during the tennis match against Korean tennis player Hyung-Taik Lee in the second round of the ATP tennis tournament at the BMW dpa) - German tennis player Thomas Haas hits the ball during the tennis match against Korean tennis player Hyung-Taik Lee in the second round of the ATP tennis tournament at the BMW](https://c8.alamy.com/comp/D3JE59/dpa-german-tennis-player-thomas-haas-hits-the-ball-during-the-tennis-D3JE59.jpg)
dpa) - German tennis player Thomas Haas hits the ball during the tennis match against Korean tennis player Hyung-Taik Lee in the second round of the ATP tennis tournament at the BMW
![German tennis professional Thomas Haas hits the ball at the first round double match with Stepanek from the Czech Republic against Aspelin from France and Hanley from Australia at the ATP tennis German tennis professional Thomas Haas hits the ball at the first round double match with Stepanek from the Czech Republic against Aspelin from France and Hanley from Australia at the ATP tennis](https://c8.alamy.com/comp/DAJR31/german-tennis-professional-thomas-haas-hits-the-ball-at-the-first-DAJR31.jpg)
German tennis professional Thomas Haas hits the ball at the first round double match with Stepanek from the Czech Republic against Aspelin from France and Hanley from Australia at the ATP tennis
![Tommy Haas video: What we can learn about sports psychology by watching a German tennis star berate himself. Tommy Haas video: What we can learn about sports psychology by watching a German tennis star berate himself.](https://compote.slate.com/images/f9584e38-8443-442b-a11e-34f6b80b121a.jpg?crop=568%2C405%2Cx0%2Cy0)