Three-time major winner Jordan Spieth has dismissed rumours that he was considering joining LIV Golf as "categorically untrue".

While the likes of Phil Mickelson, Bryson DeChambeau, Patrick Reed and Brooks Koepka have signed up with the Saudi-backed circuit, Spieth reiterated that he is committed to the PGA Tour and attempting to win more major titles.

In a post on his official Twitter account, the 28-year-old wrote: "Because of false reporting today, I feel the need to comment.

"Let me be clear, any reports that I am contemplating competing anywhere other than the PGA Tour are categorically untrue.

"I am NOT in discussions with LIV. I have been quoted on the record for months that I fully support the PGA Tour and have never considered any alternatives.

"My goal has not changed since I began playing golf – to win PGA Tour events and major championships and to compete against the best players in the world. Those who truly know me, know what is important to me."

Earlier, Spieth had shared concerns that the 150th British Open at St Andrews could be reduced to a "wedge contest" unless the wind offers the Old Course some protection.

Spieth, who won the British Open at Royal Birkdale in 2017 and just missed out on a play-off at St Andrews in 2015, carded a 68 in the first round of the Scottish Open on Thursday in calm conditions that helped Cameron Tringale fire a nine-under 61. He shot 72 today in windier weather for a share of 20th place at the halfway mark.

Asked if the St Andrews layout might become defenceless in similar conditions to Thursday, Spieth said, "Yeah, I think it might be.

"It's hard for me to tell given 2015 we had so much wind that we couldn't even play. But I think if it's like it was this morning out here, it's just a wedge contest, really.

"It was not necessarily built for today's technology. But I think that even a nice 10-15 mph (wind) would show something to it. It doesn't look like we are going to get any rain, so I think the defence could be how fast it plays."

Spieth added that conditions could become similar to the 2013 edition in Muirfield, when the first two days were played in baking temperatures and players found it almost impossible to stop the ball on the greens.

"It could get like Muirfield was in 2013 and I think that regardless of wind conditions, that would change the golf course significantly and make it challenging to hold fairways and greens," the three-time major winner said.

The British Open will be played from 14-17 July and is expected to draw a record attendance of 290,000. It will be the 30th time that golf's oldest major has been held over the Old Course.