AUGUSTA, Ga. -- Rory McIlroy will take a four-stroke lead to the final round of the Masters after shooting a 2-under 70 on a sweltering Saturday at Augusta National. McIlroy struggled through the front nine, but none of his closest challengers made much of a move. When he rolled in a 25-foot birdie at the 17th, he suddenly had plenty of breathing room going into Sunday. The 21-year-old from Northern Ireland has been in the lead every day, and he'll have his biggest advantage yet with a 12-under 204. Four shots back are 2009 Masters champion Angel Cabrera, Charl Schwartzel, K.J. Choi and Jason Day. Tiger Woods went the wrong way on moving day, struggling to a 74 that left him a daunting seven shots behind.