The Briton, who ended the day with a one-over-par score of 73, fears that his failure to perform on some of the par-five holes could prove costly.
"I didn't really make enough of par fives, that's where you're scoring on this golf course," BBC Sport quotes Westwood as saying.
"It was a bad draw being out last. You sort of sigh when you see the draw. That's as hard as it will play all day. I will be out a bit earlier tomorrow and hopefully it's more scoreable."