World number one Dustin Johnson won the Masters at Augusta National in emphatic fashion to secure his second career major title.

American Johnson, whose previous major triumph came at the 2016 US Open, shot a four-under-par 68 to reach 20 under on the week, five strokes clear of Australian Cameron Smith (69) and Im Sung-jae (69) of South Korea. 

Rory McIlroy finished in a tie for fifth on 11 under after a final day 69, which left the Northern Irishman level with Dylan Frittelli and one behind Justin Thomas.

Shane Lowry carded a 73 to finish on four under overall in a tie for 25th.

Five-time Masters winner Tiger Woods endured a difficult final round as a 76 dropped the former world number one back to one under and just inside the top 40. 

The par-three 12th hole proved to be the lowlight as he found the water in front of the green three times on his way to a 10 - the highest single-hole score of his entire career.

However, the 15-time major responded in incredible fashion with five birdies in the last six holes to restore some pride to complete that closing 76. 

Masters Day Four as it happened

But it was Johnson, who rose to the occasion over the four days in Georgia.

Having tested positive for Covid-19 in October, he surpassed the tournament record of 18 under set by Woods in 1997 and matched by Jordan Spieth in 2015.

Smith and Im's totals of 15 under par are the best by a runner-up in tournament history and Smith also became the first player to break 70 in all four rounds, but Johnson was a class apart and now has two wins, three runners-up finishes, a third and a sixth in his last seven starts.

Johnson was aiming to be the first world number one to win the Masters since  Woods in 2002, but had been 0-4 when leading or sharing the lead after 54 holes in a major championship.

The 36-year-old took a three-shot lead into the final round of the US Open at Pebble Beach in 2010 but collapsed to a closing 82, while five years later he three-putted from 12 feet on the 72nd hole at Chambers Bay to finish a shot behind Jordan Spieth.

Johnson finally secured his first major title in the 2016 US Open at Oakmont, but he fell from tied first to eighth at Shinnecock Hills two years later and failed to convert a one-shot lead in the US PGA Championship in August.

Another painful failure looked a worrying possibility as Johnson saw his four-shot overnight advantage reduced to a single stroke when he played the first five holes in one over as Smith and Im picked up two early birdies.

Final Leaderboard

Johnson produced a brilliant response with a birdie on the par-three sixth and, with Im making a bogey, the lead was briefly back to three until Smith conjured an amazing birdie from the trees on the seventh.

Smith was unable to pick up a shot on the par-five eighth but produced another incredible recovery shot from the pine straw on the ninth that took a fortunate bounce and rolled down to four feet to set up a birdie.

Johnson had birdied the eighth moments earlier to give himself a two-shot lead heading towards the back nine and was given some welcome breathing space when Smith dropped a shot on the difficult 11th.

With mud on his ball in the 13th fairway, Johnson wisely opted against going for the green in two on the par five but calmly hit his third shot to 12 feet and holed the birdie putt.

Johnson was not finished yet and further birdies on the 14th and 15th made him the first player in tournament history to reach 20 under par.