Duke, Tringale share Zurich Classic lead updated 7:18 p.m. (AP) - Cameron Tringale and Ken Duke topped the Zurich Classic leaderboard at 7-under 65 on Thursday, leaving defending champion Bubba Watson six strokes back at TPC Louisiana in his first tournament since winning the Masters. Tringale birdied the final four holes and finished the round with eight birdies and a bogey. Duke had seven birdies in a bogey-free round. Both players are winless on the PGA Tour. Steve Stricker, Ernie Els, Daniel Chopra and Chris Stroud were a stroke back at 66. Ben Curtis, coming off a victory Sunday in the Texas Open, was another shot behind along with John Rollins and Jason Dufner. Watson had four birdies and three bogeys in his 71. Second-ranked Luke Donald opened with a 73.