The defending champion, who began Sunday six shots off the pace, fell out of contention by taking seven at the par-four fifth.
However, he responded well to card a level-par 70, which left him tied for eighth on three under.
"Obviously it was disappointing but I fought back well," he told reporters. "I was four-under at that point and had just missed a short putt on the fourth to get to five.
"After doing that I just wanted to post as good a finish as I could.
"I saw a lot of great signs out there today. Hopefully I can just bring that through to the next few weeks and have a strong finish to the season."