Boxing's Golden Boy and former champ Oscar de la Hoya has checked himself into rehab for substance abuse. The former pro boxer has gone public with his decision to enter rehab by posting on Facebook, Canelo Alvarez and I have big fights coming up this weekend. His is the ring and mine in treatment. I will not be at the fight this Saturday to cheer Canelo to victory since I have voluntarily admitted...myself disease must come first. Thank you for your understanding. This is not de la Hoya's first stint in rehab, back in 2011 he admitted to cheating on his wife, using cocaine and cross-dressing, adding that he was tired of lying to the public and to himself.