Dustin Johnson says last month's U.S. Open triumph will give him the confidence to finish the job if he is in contention over the final few holes at The Open.
The in-form American, who also won the WGC-Bridgestone Invitational this month, broke his major duck with a three-shot victory at Oakmont, having trailed by four strokes heading into the final round.
Speaking ahead of the 145th Open Championship at Royal Troon, Johnson felt that breakthrough had given him a further advantage.
"I always expect to come out and perform and to contend," he said. "But it's definitely a little bit different coming out and not trying to win that first major.
"That's the biggest difference - I'm not trying to get my first victory at a major.
"It's a good feeling, for sure. But like I said, the mindset's just different. I'm not trying to win the first one. I already have. So on Sunday if I'm in contention, just knowing that I can get it done is a big confidence booster coming down the stretch."
As a sign of his supreme self-belief, Johnson claimed if he brought his best game to the South Ayrshire course, there could only be one winner.
He added: "I always feel like I'm the best player in the world, but that's just me. I've got a lot of confidence in my game. Obviously I'm playing very well right now."