Tiger Woods was only four holes into the final round of the Open, and already I was asking myself a stunning question: Is he going to be able to finish this round?

His knee is clearly killing him. You saw him on No. 1, pulling his drive way left and batting it off a couple of trees en route to his third double bogey on that hole this week.

After his tee shot on No. 2, he barely seemed able to walk off the tee box and down a small slope. He was in no rush to start walking after his approach to No. 4, possibly because his knee was hurting.

I hope I'm wrong, but I'm not sure he can keep hitting golf shots and walk all 18 holes. I think his ability to physically finish the round may be in question. That would be a crummy way to end the Open, not to mention anticlimactic after his remarkable heroics Saturday.

(Photo: John Biever/SI)