Former world number one golfer Dustin Johnson confirmed on Tuesday he has resigned his membership of the US PGA Tour as he prepares to play in the breakaway LIV Golf Invitational Series.

Dustin Johnson said Saturday that travel issues around golf tour events have prompted him to opt out of consideration for the US squad to compete at the Tokyo Olympics.

World number one Dustin Johnson, who began the round with a four-stroke edge, has not converted a 54-hole lead into a major title in four attempts.

Top-ranked Dustin Johnson seized command of the Masters on Saturday, matching the 54-hole record at Augusta National to grab a four-stroke lead in quest of a second major title.

Top-ranked Dustin Johnson birdied his way through Amen Corner and clung to a share of the lead with South Korea's Im Sung-jae in Friday's second round of the 84th Masters.

The victory means Dustin Johnson has now won at least one tournament in each of the 13 seasons he has been on the PGA Tour.

World number one Dustin Johnson rebounded from a shock early exit at the British Open to capture the Canadian Open title on Sunday for his third victory of 2018.

Rory McIlroy, who leads a host of the sport's biggest names to have withdrawn in controversial circumstances from next month's Rio Olympics, is bidding to win his fifth major and second Open after his victory at Hoylake in 2014

Dustin Johnson finished three shots in front of fellow Americans Jim Furyk and Scott Piercy and Irishman Shane Lowry at the 2016 US Open