Former Open Champion Louis Oosthuizen was the pick of The European Tour Members as Jason Dufner shone again on the US PGA Tour.
Dufner, winner of last week's Byron Nelson Championship, fired a six under par 64 for an 11 under in total after he claimed a hat-trick of birdies on holes one, two and three.
The American leapfrogged overnight leader Zach Johnson who lies two back after a three under 67 at the Crowne Plaza Invitational..
Oosthuizen was also round in 67 to sit two under, while Sergio Garcia is a shot further back after following his opening 66 with a 73.
Korean Noh Seung-yul and Swede Carl Pettersson are also one under after rounds of 69.