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It has been a bit of a stop start day so far for Rickie Fowler with the American making the turn in level par.
A birdie on on the three was followed by a bogey on five and Fowler will be hoping to pick up a couple of shots on the back nine.
Meanwhile, Kevin Kisner is in the clubhouse on -5 thanks to a terrific round of goal which included just one dropped shot.
Some big names teeing off now with Henrik Stenson, Tommy Fleetwood and Jimmy Walker currently striding up the first fairway.
We are now into the afternoon of the 147th Open Championship, and it's American Kevin Kisner that holds the lead at -5, but we have 24 golfers currently under par, with the likes of Jordan Spieth, Rickie Fowler, Thomas Pieters and Jon Rahm catching the eye of those golfers in red figures.
With conditions set to get a little tougher as the day goes on then we could see some of the later starters struggling to make it into the red.
However, it's been an enjoyable morning of golf, and we still have eight more hours of golf to enjoy.
American Kevin Kisner has birdied holes 13, 14 and 15 to move to -5 and is now an outright leader of the Open Championship.
Having reached the turn on -2 (1 eagle, 1 birdie, 1 bogey), Kisner has sparkled on his back-nine and a trio of birdies has catapulted him to the front of the field.
The wind maybe picking up at Carnoustie, but the players are still dealing with the conditions and Kisner just shows that low scores can be achieved.
Erik Van Rooyen will rue his final hole bogey, but the South African will be happy with his first round score of 67, and he is the clubhouse leader at -4.
The debutant has been solid all morning in easy conditions, but with the wind now picking up around the course then Van Rooyen could be sitting at the top of the Open Championship Leaderboard for a fairly long time.
There's a gaggle of golfers one shot behind on -3 with Danny Willett and Patrick Cantlay both a shot off the lead and coming to the latter part of their rounds.
Reigning champion Jordan Spieth is ominously waiting on -2, though, and with only five holes played the American will fancy his chances of toppling Van Rooyen off the summit.
Last week's Scottish Open hero Brandon Stone has continued his good form at the start of his Open first round, as he is -3 thru eight holes, and is two shots off leader and fellow South African Van Rooyen.
Meanwhile, back on hole three Rickie Fowler has made a tremendous 50ft putt to pick up his first birdie, while his playing partner Jon Rahm produced a monster drive on the same par-4 to reach the green in one. A two-putt from the Spaniard means he will join Fowler on -1.
What a day South African debutant Erik Van Rooyen is having. A 250/1 outsider at the start of the tournament, he is now an outright leader at -5 as he heads into his final three holes of the first round.
Former Masters champion Danny Willett is also sparkling at Carnoustie, and he is -4, while Matthew Southgate and Gary Woodland are a further shot back at -3.
Reigning champion Jordan Spieth has made a decent start as he birdies the second to go -1, while his fellow countryman Rickie Fowler has now teed off, and is level par after one hole.
Reigning champion Jordan Spieth was forced to give back the Claret Jug on Monday, but the American has just teed off at the first as he looks to become the first player since Padraig Harrington in 2008 to win back-to-back Open Championships.
Justin Rose is second favourite for the event, but having not built on his fine 4th placed finish at the 1998 Open the Englishman then he will hope his 20th Open can see him shine. He has just set off alongside Spieth.
Meanwhile, up front Van Rooyen still leads on -4.
The benign conditions at Carnoustie are seeing a host of players move into red figures, but it's South African Erik Van Rooyen that holds the outright lead, as he heads into the final third of his round. Van Rooyen is -4 thru 11 holes, which is one shot ahead of the English pairing of Matthew Southgate and Danny Willett.
Over the next hour, though, we will see some big-hitters take to the course with Jordan Spieth and Justin Rose teeing off at 9:58am, while 11 minutes later Rickie Fowler and Jon Rahm hit their first balls of the event.