Scott Piercy holds a commanding four-stroke lead coming into the final round of the 3M Open, after posting a five-under 66 at TPC Twin Cities.

Coming into moving day with a three-shot lead, Piercy was red-hot on the front nine on a rain-interrupted Saturday in Blaine, Minnesota, scoring five consecutive birdies between holes three and seven.

A bogey on the par-five 18th to close out the round put him on 18-under after 54 holes, moving him four shots clear of Emiliano Grillo in second.

Piercy's last win on the PGA Tour came alongside Billy Horschel as the 2018 Zurich Classic, with his last solo win on the tour going back three years further, taking out the 2015 Barbasol Championship.

Grillo's last win on the PGA Tour also came in 2015, winning the Frys.com Open in a playoff, and he's in contention despite an up-and-down third round amid suitable conditions.

Afternoon thunderstorms caused the third round to be moved up, and without much, the more accessible pin locations and shortened course distance made for low scores.

Grillo and Im Sung-jae were the only players to finish Saturday in the leaderboard's top ten with a third-round score of less than five-under.

Going four-under over the opening six holes after an eagle on the par-five sixth, the Argentine also had to birdie the last to make up for bogeys on the ninth and 15th holes.

Doug Ghim and Tom Hoge are a further stroke back on 13-under, with both posting scores of six-under 65 for their third rounds.

After three consecutive birdies between five and seven, Finau made an extraordinary par save on the par-four ninth, after failing to make the green with his opening three shots.

With the ball nestled in the rough just off the green, the 32-year-old turned his putter sideways and after a couple of practice strokes, made a 34-foot save with the putter's toe.