Shane Lowry sits tied for third after an impressive opening round at the Memorial Tournament in Ohio, with Seamus Power just one stroke further back.

Rory McIlroy looked set to join Lowry on three-under par overnight until a disastrous triple bogey on the 18th saw him tumble back to even par and an opening 72.

2019 Open Champion Lowry made a stunning start around the Jack Nicklaus designed Muirfield Village course, beginning on the back nine and birdieing five holes on the trot from the 11th to 15th to get to five-under early.

However, he stumbled late on his outward nine and around the turn, with three bogeys in four holes on 16, 18 and 1. He gained a shot back with a birdie on 2 and parred his way home to sit on three-under.

McIlroy had climbed to three-under after an impressive round with four birdies and a solitary dropped stroke.

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However, his good work was entirely undone after a nightmare on 18.

The four-time major winner found heavy rough off the tee, could only advance his second shot 70 yards before over-hitting the green with his third. After failing to find the green with his fourth, it was clear a big score was coming. The eventual triple bogey 7 saw slip back to tied-31st.

Seamus Power is well placed one shot further back from Lowry in tied-10th after an opening 70.

The two-time PGA Tour winner rattled off three birdies in a row from 6th to 8th, with another at 11, alongside two dropped strokes.

Davis Riley holds the overnight lead on five-under after a scintillating finish, with three birdies in his final four holes to post a five-under score of 67.

The 26-year-old American, operating on the Korn Ferry Tour until recently, began his round on the back nine, with birdies on 11 and 14 and an inevitable bogey on 18 before making his move on the inward nine.

England's Matt Wallace holds sole possession of second place after a fine round of 68 on Thursday, despite a bogey at the treacherous 18th.

Wallace, who claimed his first PGA Tour victory at the Corales Puntacana Championship in the Dominican Republic in March, registered six birdies and two bogeys en-route to a four-under par.

Joining Lowry among the cluster of players on three-under is Jordan Spieth, who dropped just one stroke at the 18th in an uncharacteristically steady opening round.

Masters champion Jon Rahm is among those players on two-under, alongside Power, while two-time major winner Collin Morikawa is one stroke further back after an opening 71.