He retired in 2006 but made the headlines again last year with the publication of his explosive autobiography `` Open '' in which he admitted failing a drugs test in 1997 , but said it came at a period when his personal life was in turmoil . Your chance to quiz tennis legends , Steffi Graf and Andre Agassi . The tournament will be held at the new National Tennis Centre in London from July 5-7. CNN 's Candy Reid will interview the pair on May 19 -- just add your question .
Your chance to quiz tennis legends , Steffi Graf and Andre Agassi . The tournament will be held at the new National Tennis Centre in London from July 5-7. CNN 's Candy Reid will interview the pair on May 19 -- just add your question .