MARIO BACK IN THE SADDLE AT HASTINGS

Mario Gutierrez, the ever-so-popular jockey who gave thoroughbred racing a big shot in the arm with his ride to glory on I’ll Have Another with 2012 Kentucky Derby and Preakness victories, returns to his roots Tuesday at Hastings.  Mario won last week’s $125,000 Santa Anita Juvenile aboard Wake Up Nick for trainer Doug O’Neil, also…