Through it all, Kevin Chappell emerged as the Round 3 leader after a 1-under 71 powered by a pretty strong finish.
He made a clutch par save at 17 after he drove to the front fringe and opted to putt, but he misjudged the line and pace and then raced his birdie putt four feet past the cup before the return dropped in the left side.
Koepka, trailing Chappell by a shot coming up the 18th, took a three-iron out of his bag and considered taking a crack at reaching the 606-yard, par-five hole in two.
Koepka had a four-foot putt to tie Chappell for the lead on the par-5 14th but missed and another on the par-3 16th that hung on the lip of the hole and would not fall.More news: GM halts operations in Venezuela after factory is seized
"It says something about me and the growth that I've made", he was quoted as saying by pgatour.com.
Australia's Aaron Baddeley was fifth on 280 after a closing 68, with Aussie Cameron Smith, Americans Ryan Palmer and Brian Gay and South Korean Kang Sung-Hoon sharing sixth on 281. The 30-year-old made six birdies compared to only two bogeys in his final round.
Similar to last weeks RBC Heritage, there are 18 players that are four strokes or less away from the leader setting up what should be a fun Sunday to watch.
However, three birdies in his final five holes in a bogey-free back nine lifted him to the top of the leaderboard on eight under after a round of 71.More news: Christian McCaffrey: Stanford OC: CAR scheme flawless for McCaffrey
Laird finished his day with a wonderful birdie on the par-five 18th hole.
Watching Chappell finally close the door on his first PGA win would be fun to watch, and well deserved, but the player to keep an eye on tomorrow will be Palmer.
At Ridgedale, Missouri, Carlos Franco and Vijay Singh teamed to shoot a course-record 12-under par to rally from seven shots behind and win the PGA Tour Champions' Bass Pro Shops Legends of Golf at Big Cedar Lodge. Haas would go on to win on the second playoff hole against Lohr.
Kevin Chappell is now a PGA Tour victor.More news: Trump says he will release tax reform package next week
Wiesberger's 71 featured par saves on the 12th and 17th and almost hit the pin with his approach to the last hole but was forced to settle for a par and a trip back up the 18th. He found nine (of 14) fairways and 11 greens in regulation, gaining 4.546 strokes tee-to-green.