![Roger Federer reveals one person in tennis he makes fun of - 'He used to always complain' | Tennis | Sport | Express.co.uk Roger Federer reveals one person in tennis he makes fun of - 'He used to always complain' | Tennis | Sport | Express.co.uk](https://cdn.images.express.co.uk/img/dynamic/72/590x/secondary/Roger-Federer-and-Tommy-Haas-have-been-close-friends-for-nearly-20-years-2018474.jpg?r=1566373844874)
Roger Federer reveals one person in tennis he makes fun of - 'He used to always complain' | Tennis | Sport | Express.co.uk
![July 26, 2005; Los Angeles, CA, USA; ATP tennis player TOMMY HAAS during the Mercedes-Benz Cup at the Los Angeles Tennis Center. Mandatory Credit: Photo by Vaughn Youtz/ZUMA Press. (©) Copyright 2005 July 26, 2005; Los Angeles, CA, USA; ATP tennis player TOMMY HAAS during the Mercedes-Benz Cup at the Los Angeles Tennis Center. Mandatory Credit: Photo by Vaughn Youtz/ZUMA Press. (©) Copyright 2005](https://c8.alamy.com/comp/DM732Y/july-26-2005-los-angeles-ca-usa-atp-tennis-player-tommy-haas-during-DM732Y.jpg)
July 26, 2005; Los Angeles, CA, USA; ATP tennis player TOMMY HAAS during the Mercedes-Benz Cup at the Los Angeles Tennis Center. Mandatory Credit: Photo by Vaughn Youtz/ZUMA Press. (©) Copyright 2005
![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)