Jordan Spieth leads by one after first round of FedEx St Jude Championship

Rory McIlroy sits on three under, after he split three bogeys with four birdies and an eagle.

Jordan Spieth hits from the first tee during the first round of the St Jude Championship golf tournament (George Walker IV/AP)

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.