Article continues below advertisementOK! can reveal the secrets behind why Andre Agassi has credited his marriage to Steffi Graf with saving his life.His declaration she was his savior came after a period of addiction and emotional turmoil that threatened to derail both his mercurial tennis career and his future, with those closest to the "bad boy" of the courts now describing their 24-year union as the stabilizing force behind one of sport's most dramatic comebacks.The former world No.