He was standing on the 12th tee when he watched Knox's ball roll onto the green and into the cup. He is in the hunt for his second PGA Tour win.
It is just the third ace at the 15th hole in the history of the tournament and it propelled Kokrak, who has yet to win on the PGA Tour, into a share of the lead with Paul Casey at the time.
Casey scored on the other par-5 holes as well, sinking a three-foot birdie putt at 14, a six-footer at the first before holing a 27-footer for eagle at the fifth.
"It took a nice hop and rolled in there just like a putt", Kokrak said.
Donald had a share of the lead until he bogeyed the par-3 eighth, his 17th hole of the day. "But it's a hole that fits me". He also brought two cases of beer into the media room, which is not tradition.
Kokrak shot 30 on the back for a 66 and was poised to play in the final group until Johnson made his birdie on the 18th.
Scotland's Russell Knox, tied for third after the first round, barely made the cut after soaring from a 67 on Thursday to a 76 in windy conditions on Friday. Rarely does the world's top-ranked player make a detour to Innisbrook, and rarer still is the opportunity to watch him contend for what would be a third victory on the year before the azaleas even have a chance to bloom.
"It was one of those holes where we knew we couldn't hit one more club to get it back there", Kokrak said.
Casey jumped 28 spots to take the lead at six under, alongside American Austin Cook. "I like the way I've turned round my season a little bit". "Today I didn't do anything fancy". I thought it was flawless.
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However, when it hits land around 00:00 GMT on Sunday, it will still be a strong system with wind gusts of approximately 225km/h. The Australian Bureau of Meteorology has forecast as much as 500mm rainfall is expected in some places.
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He added that the United States is "not looking for anything other than taking care of a lot of people". The Russian side also intends to urge the USA to help in facilitating intra-Venezuelan dialogue.
Reed's card included three double-bogeys.
Anirban Lahiri made a superb birdie-birdie start but was unable to keep the momentum going.
"I worked very, very hard on the game, and for whatever reason, it's slowed things down", Casey said.
The final hour changed the dynamics of the Valspar Championship, just not the lead. He was runnerup in 2012.
"I think mentally past year I was sort of hoping, obviously hoping, I would win, wanting to win".
Here he is again.
Young guns Viraj Madappa (70) and S Chikkarangappa (68) were the best-placed Indians at tied 22nd after three rounds of the Maybank Championship here Saturday.
'I feel really good about it because last week was rubbish, ' Casey told PGA Tour Live. "Let's not focus on the careless mistakes and try to get it going on the weekend".
The course is so demanding, and typically tougher in the afternoon, that the tournament is wide open.