Green the clubhouse leader in Memphis June 7, 2013 - 5:02AM Nathan Green fired a 66 to take the early lead at the US PGA's St Jude Classic in Memphis on Thursday. The Australian, who has struggled so far this season making just two cuts in four events on the PGA Tour, carded four birdies in a blemish-free round. Former US PGA champion David Toms was among the chasing pack on three under after firing three birdies on his back nine and he sat alongside unheralded Americans Nicholas Thompson and Scott Stallings. Stallings has already had some good news this week after the withdrawal of Roger Chapman handed him in a place in the US Open which begins at Merion next Thursday. Charles Howell, who is currently 68 in the world and looking to move into the top 60 to qualify for next week's major, finished his first round one over while world number 67 Jimmy Walker was two over. Boo Weekley, who won the Crowne Plaza Invitational a fortnight ago, was in the group at two under while a large collection of players including Padraig Harrington, Ian Poulter and Brian Davis were all one under after finishing their rounds.