Luke Donald revives hopes of regaining world No 1 spot after promising second round in New Orleans The American capped a bogey-free round with an eagle on the par-five 18th to reach 12 under and establish a one shot lead over Russell Knox, John Rollins and Ken Duke. Knox, a 26 year-old who was born in Inverness but now lives in Florida, followed his opening round 69 with a 64 which contained an eagle, seven birdies and a bogey. A further shot back on 10 under were Greg Chalmers, who also fired a 64, Steve Stricker and Ernie Els. Defending champion Bubba Watson had his second straight 71 to make the cut by a stroke in his first tournament since his Masters win, with Northern Ireland's Graeme McDowell joining him on two under after a disappointing second round 73. Brian Davis was alongside Donald on six under, while fellow Englishmen Greg Owen and Justin Rose were a further shot back. However, a second round 69 was not enough to see Carshalton-born, Alabama-based Gary Christian make the cut.