Defending CJ Cup champion Rory McIlroy started strong to be one shot behind joint leaders Gary Woodland and Trey Mullinax after the opening day at Congaree Golf Club in South Carolina.

The Northern Irishman is tied with six players at five-under after carding opening rounds of 66, including recent Shriners Children's Open winner Tom Kim.

McIlroy pieced together birdies on the fourth, fifth and sixth holes, but his round leveled out, finishing bogey-free.

Woodland was one of the pre-tournament favourites and he impressed early, with three straight birdies to open his round.

The American dropped three bogeys to slow his progress, but sunk a 21-foot birdie putt on the par-four 18th to finish his round with nine birdies and a share of the lead.

Co-leader Mullinax birdied four of his first six holes and six of his first 11, highlighted by a 23-foot birdie putt on the 11th.

Kim, who is only 20-years-old, stormed up the leaderboard late with three birdies in his final six holes, including rolling in a 28-foot birdie on the 16th although he slipped from the lead with a bogey on the 18th.

McIlroy and Kim are joined by Cam Davis, Kurt Kitayama, Aaron Wise and Wyndham Clark in carding opening day rounds of five-under-par.

Norwegian Viktor Hovland and American Tyrrell Hatton headline the following six-member group at four-under.

Two-time PGA Championship winner Justin Thomas is back at three-under, while former world number one pair Jon Rahm and Jason Day are at two-under. Scottie Scheffler finished with an even round.

Three-time major winner Jordan Spieth had a poor round that included a double bogey on the sixth and four bogeys to be four-over-par.

Cameron Tringale was delighted with his "red-hot" putting display after shooting a remarkable nine-under 61 to take the lead at the Scottish Open, matching the course record in the process. 

Tringale reached the turn at three-under after making a steady start, but the 34-year-old – whose only previous professional victory came in the Franklin Templeton shootout team event in 2014 – picked up the pace to birdie six consecutive holes through 10 to 15 and finish day one top of the leaderboard.

The American ended Thursday three shots clear of compatriot Gary Woodland and four ahead of South Africa's Justin Harding – one of four LIV Golf players to feature at the Renaissance Club in North Berwick.

In claiming a place among the early leaders, Harding fared far better than fellow LIV Golf star Ian Poulter, who made nine bogeys during a calamitous opening round to finish eight-over.

Poulter was allowed to feature pending an appeal against a DP World Tour ban but may be wishing he had not bothered after slumping to near the bottom of the leaderboard, at one point sharing last place in the expanded field.

But the story of the day was undoubtedly Tringale's career-best round. He is now targeting greater consistency after setting a terrific pace. 

"I got lucky this morning with the wind not being up, the other guys in my group were off to hot starts, making some putts and I decided to join the fun on number five," Tringale told Sky Sports. 

"Then my putter got red-hot, and that's how you do it!

"You do the best you can, I think I was just fortunate with the amount of putts I holed and I got plenty of practice shots around the green, I didn't have to use them all that much because I struck it pretty nicely.

"But I was just dialled in on the greens and that tells the story. I'm just really focused on what I can control, I've done it poorly enough to learn the lessons. 

"Hopefully I can continue to go and play, and the good outcomes will come as a by-product if I can keep my head on straight."

Cam Tringale moved into the lead ahead of the final day at the 3M Open in Minnesota after carding a five-under round including an eagle on Saturday.

The American raced up the leaderboard as overnight joint leaders Ryan Armour and Adam Hadwin and slid, with an even round and two-over respectively at TPC Twin Cities.

Tringale's surge was set up after becoming only the third player to reach the par-five 12th in two, sitting at 12 under after 54 holes.

He enjoyed a bogey-free third round, birdieing his first two holes, with only Beau Hossler, who is joint for 12th, bettering his round on Saturday with a six-under-65.

Gary Woodland and Maverick McNealy are joint in second on 11 under after strong third day rounds.

Pat Perez, Cameron Champ, Jimmy Walker and Charl Schwartzel are all 10 under. Champ looms large having carded 10 under from his past 27 holes.

Rickie Fowler appeared set to contend again but carded an eight on the 18th hole to finish six off the lead having found the water.

He was not alone in struggling on the 18th which saw five bogeys, three double bogeys and seven triple bogeys or worse.