Greg Norman could not recapture the form he showed last week at the Open as he ended the first round of the Senior Open at Royal Troon on four over.

The 53-year-old led the Open going into the final round, but eventually ended in a tie for third behind Padraig Harrington after a final-round slump.

And after his first round in Scotland, Norman said: "Things weren't going my way early on. I had to hang in there."

Meanwhile, Bruce Vaughan and Eduardo Romero shared the lead at three under.

Vaughan could have been clear of the field, but a double bogey at the 6th and a triple bogey at the 12th spoiled a scorecard which also contained eight birdies.

"It was either feast or famine," said Vaughan.

"Outside of those two holes though, it was a good round."

Norman was one of the stories of the week at last week's Open, but his form at Troon for the senior version of the championship was well short of his showing at Birkdale.

"The ball just wasn't rolling my way," he added.

"I got to the first tee and I never played this golf course in this wind before. I didn't feel that confident with some of the tee shots, and I hit it into a couple of divot holes which didn't make me feel good on the first few holes.

"But there's more than one round in a golf tournament."