Dustin Johnson said on Wednesday that his US Open win in June has given him the confidence to know that he "can get it done" at the 145th Open Championship at Royal Troon this week.

SOUNDBITE (English) Martin Slumbers, R&A chief executive

(On whether Donald Trump's Turnberry golf course could be considered to host a future Open Championship)

"Turnberry is, was and is, part of the pool of courses for the Open Championship. There are at the moment nine courses and Turnberry is one of those. We have announced Opens out to 2019. And although there are some fascinating ones to happen between then and 1990, it's going to be pretty special as we go back to Portrush. We're also very close to announcing '20 and '21, one of which will be in England, and one of which will be at St. Andrews. We don't have to consider beyond that for a couple of years, and we'll pick that up in a couple of year's time."

SOUNDBITE (English) Martin Slumbers, R&A chief executive

(On the chances of Ireland hosting an Open Championship)

"I think we have nine courses for the Open Championship. Nine quite different courses within that pool, and I think that's quite an adequate group that we have. Respect to the island of Ireland, I think Royal Portrush is going to be very exciting in 2019. If you haven't been to see it, anyone, it is quite spectacular, and I think it will showcase golf in just a wonderful way."

(Q: Is there anything that prevents you from hosting a championship in the Republic of Ireland?)

"Well, at the moment they would do, yes. In the round of our view that we'll only go to a mixed-gender club (possible host Portmarnock is an all-male club)."