![dpa) - German tennis pro Thomas Haas plays a backhand during his first round match against Dominik Hrbaty from Slovakia at the ATP Masters in Hamburg, Germany, 10 May 2005. Haas lost dpa) - German tennis pro Thomas Haas plays a backhand during his first round match against Dominik Hrbaty from Slovakia at the ATP Masters in Hamburg, Germany, 10 May 2005. Haas lost](https://c8.alamy.com/comp/D3JDHC/dpa-german-tennis-pro-thomas-haas-plays-a-backhand-during-his-first-D3JDHC.jpg)
dpa) - German tennis pro Thomas Haas plays a backhand during his first round match against Dominik Hrbaty from Slovakia at the ATP Masters in Hamburg, Germany, 10 May 2005. Haas lost
![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)
Tommy Haas video: What we can learn about sports psychology by watching a German tennis star berate himself.
![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
![Champions Tennis | Tommy Haas vs Thomas Berdych • Exhibition At The Royal Albert Hall London 2021 - YouTube Champions Tennis | Tommy Haas vs Thomas Berdych • Exhibition At The Royal Albert Hall London 2021 - YouTube](https://i.ytimg.com/vi/JVbiEjQgE8g/maxresdefault.jpg)