Last year’s runner-up Ryan Palmer set the early pace at the Byron Nelson Championship with an opening six-under-par round of 64.
Palmer, second to Keegan Bradley in 2011 after a play-off, took a one-shot lead over Australia’s Marc Leishman and Germany’s Alex Cejka.
The 35-year-old, playing in his home state of Texas, is a general 8/1 chance to go one better than 12 months ago.
“It was a continuation from last year, that’s what’s cool about the whole thing,” said Palmer, who had six birdies and no bogeys.
“I felt great all day and I knew everything was going in the right direction.”
Cejka, a 40/1 chance with Ladbrokes
, was also flawless with five birdies, while Leishman produced fireworks on the back nine.
He eagled the par-four 11th and the par-five 16th, but was hampered by a bogey at the ninth.
“I drove the ball a lot better than I have been,” said Leishman, who is 25/1 with Ladbrokes. “I think I only missed two or three fairways all day.
“I haven't been hitting a lot of fairways this year so far. It's an easy game from the fairway, I'll say that.
“I drove it well and holed the par putts that kept the round going – and obviously two eagles helped as well.”
Behind Cejka and Leishman on four under was a group of seven Americans including last week’s Players’ Championship winner Matt Kuchar, who is the 6/1 favourite with Stan James
, and 2010 runner-up Blake Adams, a 25/1 chance at Paddy Power