The native of Worksop, England, held a one-stroke lead after Thursday's first round but a 1-over 73 Friday left him in a group of seven players two shots off the lead.
"I got off to a very good start, and I played pretty good from there on in even though I missed some chances," Westwood said. "But that is the nature of this golf course. It is very difficult to hole putts and a couple of greens that they've re-laid on the back nine have different speeds so it is tricky. It was nice to make five birdies in a row (holes 1-5)."
Through 54 holes, his total is 12-under 204.