Juan Carlos Ferrero is taking time out from the ABN AMRO World Tennis Tournament in Rotterdam (which starts on Monday) to answer your questions!
Juan Carlos was a French Open champion in 2003 and became the world number one in September 2003.
Nicknamed Mosquito, Ferrero was a member of the 2000 and 2004 winning Spanish Davis Cup teams and he is a huge fan of football team Real Madrid.
Ferrero reached the final of the ABN AMRO tournament in Rotterdam last year and is hoping to go one better this year, but Tim Henman and Roger Federer are two of the players standing in his way.
Send your questions using the form on the right of the page by 09:00 GMT on Saturday