The world number 56 produced a two-under-par 68 on the final day to pip American Cameron Young to the Claret Jug by one shot.Son of former All Black rugby union international Grant Fox, the 39-year-old was 52nd after playing the first two rounds in level par.But he tied the all-time record low score of 62 for a round in a major on Saturday to set up his shot at history.As the other overnight contenders faltered on a thrilling final day at Royal Birkdale, Fox produced his best under extreme pressure with birdies at 13, 14, 16 and 18 to claim, by a distance, the biggest win of his career."I don't really know what to think at the moment," said Fox. "I spoke to my kids last night and they said 'bring back a trophy'. I think this is a pretty cool one to bring back for them."He becomes just the third man from New Zealand to win a major after Bob Charles at the 1964 British Open and Michael Campbell at the US Open in 2005. The Kiwi kept his nerve as others, unaccustomed to the pressure of battling for a major wilted in a tense final round.Sam Burns held a two-shot overnight lead, but that vanished in three consecutive bogeys at four, five and six that cost the American his first major as he finished third at eight under par.South Korea's Kim Si-woo moved within sight of his major breakthrough with nine holes to play but was four over on the back nine.Young's shot appeared to have gone with a four-over par back nine on Saturday to leave the American seven shots off the lead at the beginning of the day.But the world number four stormed through the front nine in 29 shots to go from three under to eight under par and added more birdies at the two par fives on the 14th and 17th coming home to move to 10 under.However, he found the sand off the tee at 18 and smashed his second shot into the face of the bunker for a costly bogey.Scheffler falls shortDefending champion Scottie Scheffler left himself too much to do as he finished in a tie for fourth at seven under after a rollercoaster final round.The world number one began the day six back, but halved that deficit with three birdies in his opening five holes.