Depends on the lead.
If it movs out to double figures, then He will need a 67-66. If it stays where it is, then anything under par...somewhere in between, well, you can do the match from there.
so much will be determined by the conditions (winds are up today) and also the pin placements
I am watching this am to see how it goes. I bet the pins are a little easier today but will see. They were diabolic yesterday.
And lets hope Tiger got his swing fixed on the range.
and a 66 would be super duper but I would settle for anything in the 60's.