The world No. 1 was 2 up through 10 holes when Snedeker rallied with birdies at Nos. 11 and 12 to square the match, but McIlroy rolled in a 30 footer for birdie at the 15th to edge ahead and closed the match with another birdie at the par-5 18th.
“It was pretty tight,” said McIlroy, who hasn’t made a bogey this week in 32 holes. “I felt like I had a comfortable lead after nine or 10 holes, and then he made two good birdies and we’re back to all square.”
It was a deft chip to 3 feet after missing the 14th green, however, that McIlroy said was the key to the match.
“That was big. That was important,” said McIlroy, who will face Billy Horschel on Friday in his final group match. “It gave me some momentum going into the last few holes.”