DUBLIN (Ohio), June 1: Australians Rod Pampling and Nick O'Hern, and American Sean O'Hair shared a three-way tie at the top of the leaderboard after the opening round of the Memorial tournament on Thursday.

O'Hair and Pampling had identical cards on the front nine, both players posting five birdies to join O'Hern on seven-under-par 65 in ideal scoring conditions at humid Muirfield Village.

They headed a group of five players including South African Ernie Els, by one stroke, while three-time champion Tiger Woods could not capitalise on a great start, shooting two-under 70, after being three under through six holes.

Phil Mickelson withdrew when he was 2-over after 11 holes due to a left wrist injury. He expressed hope, if not complete confidence, that he would be healthy in time for the June 14-17 US Open at Oakmont.—Reuters