Shane Lowry goes into the final round at The Open in Royal Portrush holding a four-shot lead over second-placed Tommy Fleetwood.
Lowry has played some of the best golf of his career during the first three rounds at the Antrim course.
The man by his side for the tournament has been Brian 'Bo' Martin, who hails from Ardglass, Co. Down.
Who is Shane Lowry's caddy?
Martin has been carrying Lowry's bag for ten months.
The Offaly man split from previous caddy Dermot Byrne in the wake of last year's Open Championship at Carnoustie. Byrne and Lowry had been together for nine years.
In a recent blog for Paddy Power, Lowry said he regrets how the split from Byrne happened.
"It’s well known now that I split with my then caddy, Dermot Byrne, and I regret doing that mid-tournament," said Lowry.
It’s something that I felt I had to do, but I should have waited until after it was over.
But that’s the way it is, we all make mistakes. I’ve never said it to him personally, but I’ve said it publicly. If I was to do it again I would probably do it a little bit differently because Dermot is a very good friend of mine.
It put a bit of a spotlight on him which he didn’t need. We’d built a great friendship over the years; nine years together is a long time. Dermot wasn’t the problem. It was more that I wasn’t the person I wanted to be on the course.
Lowry's brother Alan subsequently spent a month as his caddy before Martin came on board.
"To be honest, that Friday evening 12 months ago, when I was thinking about caddies, ‘Bo’ (Brian Martin) was the first person in my head," said Lowry.
"My brother did a few weeks first and then Bo started with me in Portugal and it’s been good ever since."
Martin is a former champion at the Ardglass golf club. He has previously caddied for Gary Murphy, Peter Lawrie, Alex Levy and Lucas Bjerregaard.
He took a break from Lowry's bag at The Irish Open as he and his wife had just had a baby. Darra Lernihan stepped in to take over.
"Bo has been great for me over the last year," Lowry said at the press conference following the third round.
"It's like he's given me a new lease on life.
"He's so chilled. He's so relaxed. Maybe he isn't inside but he definitely comes across that way.
"Bo grew up an hour-and-a-half away in a place called Ardglass. It's a special day for him tomorrow as well.
"Hopefully we can do something special and enjoy it together."
Photo by Brendan Moran/Sportsfile