PA Sport Staff 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.” Rory McIlroy sits on three under, after he split three bogeys with four birdies and an eagle. Waterford's Seamus Power is T54 on +1. Meanwhile, England’s Tommy Fleetwood and Aaron Rai are the best of the British contingent, closing out Thursday on four under par.