Lucas Glover shot a course record six-under par 65 to take charge of the PGA Grand Slam of Golf yesterday.

The US Open champion had a day when his putter rarely failed him, firing six birdies and an eagle, and only bogeys at 13 and 16 stopped him from taking complete control of the tournament.

Glover's defining moment yesterday came at the par-five 17th when he drained a 60-foot putt for eagle, to move two shots ahead of Stewart Cink. Earlier at the par-four fourth he also sunk a lengthy putt.

And while the rest of the field endured an up and down day of birdies and bogeys, Glover's consistency was the difference between his round and that of the rest of the field.

The American hit 12 fairways and even when he missed the fairway he invariably made the green with his approach. His performance was all the more impressive given he was seeing most of the course for the first time.

"I played well," said Glover. "I'm really pleased with my round, I didn't know what to expect.

"I didn't exactly burn up the driving range last week, but I'm very pleased, I knocked in a bunch of putts and all around I'm happy.

"Stewart (Cink) and I were joking during the round. We both played well today, and were saying 'where was that last week that, kind of thing'. I didn't hole much at The Presidents Cup, so I was pretty excited to see some go in."

Glover will go into today's second round with a two-shot lead over his fellow American and, despite the $600,000 first prize, plans on having fun, first and foremost.

"I'm just going to have fun tonight, come out tomorrow and get loose and go have fun," said Glover yesterday.

"That's what we are here for. We tried – every one of us tried hard today but we had fun in between shots and cut up and picked on each other a little bit, so we'll do the same thing tomorrow."

Cink's solid round of 67 was built around his ability to get up and down at important moments. Level with Glover at three-under at the turn, Cink moved to four-under when he chipped in at ten for a birdie.

But the British Open champion then dropped a shot at the par-three 13 when he found the greenside bunker, and hit his second shot too far past the hole.

From then on, however, he didn't drop a shot and even made up some ground on Glover when he got up and down at 16 after all the players had found sand at the 235-yard par three.

Of the four, Angel Cabrera will be the most disappointed with his day, level with Glover and Cink at the turn, the wheels started to come off his round at 16.

The only one to actually hit the green, he rolled into the backside bunker, left his second shot short and two-putted.

Cabrera then imploded on the next hole, flirting with the water on his drive, he stuck his approach into the steep slope at the front of the green, fluffed his third and fourth shots and two-putted from 14-feet. The Argentinian ended his day five shots behind Glover and will need something special to catch the leader.

Y.E Yang meanwhile was just happy to get off the course without the embarrassment of finishing over par.

The Korean's woes began at the fourth where his second shot out of a fairway bunker struck the lip and then careened into a tree. He struggled to a double-bogey six, dropping back to even par after a good opening and never really recovered.

Even though he birdied seven, it came after another duffed shot out of a fairway bunker when he again hit the lip and the ball travelled just ten yards.

The back nine was more of the same, and when he did miss the sand, he struggled with his overall accuracy, finding just 10 greens in regulation.

Ironically, both he and Cabrera had fewer putts than Cink and Glover, but it invariably took them longer to get to the green.

The only consolation for Yang is the fact that he is still recovering from jet lag, and another good night's sleep should get him back to something approaching his best.

"I tried my best," said Yang. "Unfortunately I didn't hit under par, fortunately I didn't embarrass myself by hitting over par. Hopefully tomorrow I'll end on a stronger note."