Five days after describing winning the Open on the Old Course as golf's Holy Grail, Rory McIlroy will take a share of the lead into the final round of the 150th Championship following a stunning Saturday at St Andrews.FULL LEADERBOARDBuoyed by a brilliant eagle from a bunker on the 10th, McIlroy carded a superb third round of 66 to boost his bid to end an eight-year major drought and become the first European winner at St Andrews since Nick Faldo in 1990.Only a bogey on the famous Road Hole 17th prevented McIlroy from holding the outright lead, with Ryder Cup team-mate and playing partner Viktor Hovland, chasing his first major title, carding a bogey-free 66 to join the Northern Irishman on 16 under.McIlroy lifted the Claret Jug in 2014 and won his fourth major in the US PGA a month later, but has not won one of the game's biggest titles since.Augusta National co-founder and three-time Open champion Bobby Jones famously said that a player's career would not be complete without lifting the Claret Jug on the Old Course."I have a lot of belief in myself, I know I can do it again."And while McIlroy does not think that is strictly true, the world number two was well aware of the significance of winning the oldest major title at the Home of Golf."I don't know if a golfer's career isn't complete if you don't, but I think it's the Holy Grail of our sport," McIlroy said in his pre-tournament press conference on Tuesday.Asked about the significance of winning on Sunday, McIlroy told Sky Sports: "It would mean everything because of what I have been through the last few years, trying to get the fifth one."I have a lot of belief in myself, I know I can do it again.