Andy Ruiz Jr once turned boxing upside down. Can he do it again at 36?

Seven years after springing one of the biggest upsets in boxing history, the Mexican Rocky is back with his old trainer for one final run at the heavyweight summitSeven years ago, Andy Ruiz Jr became the first fighter of Mexican descent to win the world heavyweight championship in one of the biggest upsets boxing has ever seen, stopping the undefeated Anthony Joshua inside seven rounds at Madison Square Garden.A replacement opponent summoned on five weeks’ notice who went off as an 11-1 underdog, Ruiz came off the canvas in the third to knock Joshua down four times before the referee finally waved it off. Hailed as the “Mexican Rocky”, he was lionized as a border-straddling hero in his hometown of Imperial, the dusty agricultural community framed by the mountain ranges and flat deserts of