CANELO ÁLVAREZ TO FACE TERENCE CRAWFORD FOR UNIFIED SUPER  MIDDLEWEIGHT CHAMPIONSHIP IN RIYADH SEASON SHOWDOWN AT ALLEGIANT  STADIUM IN LAS VEGAS ON SATURDAY, SEPTEMBER 13  TICKETS ON SALE THIS FRIDAY, JULY 18, PRESALES START JULY 17 ALSO STREAMING LIVE GLOBALLY ON NETFLIX  Blockbuster Riyadh Season event features two of boxing’s