Butch Harmon reckons Tiger Woods' stunning nine-under-par 61 on the second day of the WGC-Bridgestone Invitational could have been even better.
The world number one posted his joint-lowest total on the PGA Tour at Firestone Country Club on Friday to secure a seven-stroke lead over defending champion Keegan Bradley and England's Chris Wood ahead of round three.
However, Sky Sports pundit Harmon says that Woods - who has won the WGC-Bridgestone Invitational on seven occasions, most recently in 2009 - was not entirely flawless around the Ohio course.
"I did think after Thursday when Woods left a few shots out there [as he shot 66] that he would be leading after Friday," said Harmon, who used to coach the 14-time Major victor.
"And nine-under-par for the first 13 holes of Friday's round was phenomenal - but he let a couple of little putts go, including a very short one the 15th, and he did not hit a good lay-up shot off the tee at 17.
"It could have been spectacular - but let's not forget that he had a big break at 13 when he hit his drive so far right into the trees and it ended up back in the fairway."
However, Harmon - who now coaches, amongst others, 2013 Open Championship winner Phil Mickelson - thinks it would be foolish to etch Woods' name on the Bridgestone trophy with two days remaining.
And he feels the chasing pack, which also includes Bill Haas and Henrik Stenson (-5) and Luke Donald and Jim Furyk (-4), could still contend - provided the weather is kind to them.
"There are 36 more holes to go," added Harmon. "We have seen what Tiger has done over the first two rounds but can someone else have a go [on Saturday]? Yes, I think they can.
"A lot will depend on the weather - there are predicted storms and the tee times have been pushed back - but Bradley, for one, has good vibes here as defending champion and is playing well.
"I think we are in for a fantastic weekend and we can't give it to Tiger just yet - but he is going to be awfully hard to beat."