Armour could have led outright had he not double-bogeyed the 18th

Six players shared the lead at the halfway stage of the Stanford St Jude Championship in Tennessee.

Windy weather and hard greens made it tough going for the field, a week before the US Open.

Americans Tommy Armour III, Michael Bradley, Jason Dufner, Marc Turnesa and Dean Wilson are all on three under along with Australian Gavin Coles.

First round leader Boo Weekley had an awful round, hitting 75 to tumble down the leaderboard.

Armour had a great chance to lead the field but he double-bogeyed the last to settle for a share.

Aussie Coles got to grips with the conditions to register six-birdies in his 64.

Some more familiar names are lurking just off the pace. Fiji's Vijay Singh is a shot back, alongside Davis Love III and the best European, Germany's Alex Cejka.