McIlroy and McDowell four back in Arnold Palmer Invitational after contrasting days at punishing Bay Hill

Rory McIlroy watches his shot from the seventh tee box during the third round of the Arnold Palmer Invitational golf tournament in Orlando, (AP Photo/John Raoux)

Rory McIlroy will tee off with Graeme McDowell in the final round of the Arnold Palmer Invitational after they endured wildly differing days ahead of what looks like a wide-open final round at Bay Hill.

With the course firming up by the minute, McIlroy dropped three shots in his last four holes and carded a four-over 76 that left him tied for sixth on three-under alongside McDowell and Chris Kirk, four strokes behind co-leaders Billy Horschel and Talor Gooch.