Tiger Woods admits he will have plenty of homework to do as he looks to claim a 15th Major Championship at this week's US PGA Championship.
The American was among the players due to compete at Bellerive Country Club in 2001 when the WGC-American Express Championship was cancelled due to the September 11 terrorist attacks.
The 42 year old also missed the 2008 BMW Championships at the same venue due to injury and was only able to play five holes in practice before his pre-tournament press conference on Tuesday due to thunderstorms.
"I literally haven't set foot on this golf course since that week in 2001," he said. "I didn't get up here pre British Open and yesterday I took the day off.
"Today we only got in five holes and didn't really get a chance to see a whole lot, so I'll have to do some more homework tomorrow and get a good feel for what's going on for the rest of the week.
"I needed that day off. I spent a few times in the ice bath just trying to get some inflammation down and just trying to get ready for the rest of the week.
"There's going to be certain days that I'm just not going to have the speed and the flexibility and the movement that I once did. I'm 42 now and I've had four back surgeries. So things are going to be different from day-to-day and it's just about managing it."
Woods underwent spinal fusion surgery in April last year and admits he feels blessed simply to be able to compete again, although he has come close to a first victory since the 2013 WGC-Bridgestone Invitational.
I'll have to do some more homework tomorrow and get a good feel for what's going on for the rest of the week - Tiger Woods
The 40-time European Tour winner finished second behind Paul Casey in the Valspar Championship on the US PGA Tour in March and was in contention again the following week.
Woods also led the Open Championship at Carnoustie Golf Links with eight holes to play, only to double-bogey the 11th and drop another shot on the next as playing partner Francesco Molinari went on to lift the Claret Jug.
"To go from missing the cut in the US Open to contending and at one point leading the Open on the back nine, it felt good. It felt very familiar," he said.
"Unfortunately, I made two mistakes there on 11 and 12 and it cost me a chance to win the championship. I felt like I was in control of what I was doing, and that felt good. Unfortunately, I just didn't do it."