PGA Championship 2018: Justin Thomas satisfied despite back-9 wobble in St. Louis Defending champion Justin Thomas left the course in a positive frame of mind, though he bemoaned his performance on the back nine at the PGA Championship. Seeking back-to-back titles, world No.2 Thomas opened his defense with a 1-under 69 in St. Louis on Thursday. I played well on the front nine. Had some good holes on the back nine too. Had a couple of putts that didnt quite go in. Had a nasty lip on the 16th hole. Definitely a lot more positives to take the negatives, and Im in a good position for Thursday. Its just like any other golf course. I said that at my press conference. Its soft enough to where theres going to be some low numbers, but if youre not driving it well, the rough is very difficult and long to where its hard to make birdies and save par sometimes. Ive been fortunate enough to where Ive played with him enough now that I dont - I dont want to say get wrapped up in it, but the first couple times I maybe played a little bit more attention to what hes doing, but now this is a PGA Championship, and Im trying to play the best that I can. Im focused on what Im doing.