Jordan Spieth topped the leaderboard after round one of the FedEx St Jude Championship, where he scored seven under par with a score of 63.

He goes into round two in Memphis leading Tom Kim by one shot and admitted he has been working on his putting.

“Quite a bit of putting. I played really well at the British. Tee to green, I played well enough to win,” he said afterwards.

“I didn’t feel like I missed many of my lines. I just couldn’t quite get the matching of the line and speed on the greens.

“Now we come to slopey Bermuda and very fast slopey Bermuda where I feel a little more comfortable picking lines and kind of feeding the ball in using gravity.

“I think that helped, along with quite a bit of work as best I could in Texas right now, which is really from the hours of 7:00 a.m to noon before it’s almost unbearable.

“Just tightened some things up. I tried to play a lot just to shoot scores. I had kind of taken off playing a bunch, and I think that that helped a bit in the last couple weeks.”

England’s Tommy Fleetwood and Aaron Rai are the best of the British contingent, closing out Thursday on four under par.

Rory McIlroy sits a shot back on three under, after the Northern Irishman split three bogeys with four birdies and an eagle.