Steven Davis’ overhead kick and a Jonjoe Kenny own goal before half-time decided a gripping, chance-laden game. Celtic’s wasteful finishing culminated in Odsonne Edouard’s weak penalty being saved in the closing stages. Steven Gerrard’s side host St Johnstone in the last eight next weekend. Having crushed Celtic’s bid for a 10th consecutive league title, Rangers are now three wins from adding the Scottish Cup after extending their 100% home record in domestic football this season. They showed a ruthless edge the visitors couldn’t match as the Ibrox men made it five Old Firm games unbeaten, including four wins. Five years to the day since their last Scottish Cup defeat, a shootout loss to Rangers, Celtic again fell to their biggest rivals. From the quadruple treble to empty handed in the space of four months. Celtic had their moments. Plenty of them. Stephen Welsh missed a glaring opportunity for an equaliser and Edouard and Mohamed Elyounoussi were the main culprits after the break. Ultimately, their lack of ruthlessness was clinically exposed by a Rangers side who gobbled up the two first-half chances that fell their way. Nigeria’s Joe Aribo, the game’s stand-out performer, was the architect of both, tormenting left-back Diego Laxalt who was put out of his misery when substituted at half-time. By then, the damage was done and would prove insurmountable.