American Brian Harman survived an early scare to claim his first major title in dominant fashion on a rain-soaked final day of the 151st Open Championship at Royal Liverpool.Harman's five-shot overnight lead was briefly cut to three as he covered the first five holes in two over par in miserable conditions, but the 36-year-old responded superbly to regain his vice-like grip on the Claret Jug.A victory made possible by a stunning 65 on Friday – the joint-lowest score in a Hoylake Open until Jon Rahm’s Saturday 63 – was sealed with gritty rounds of 69 and 70 for a total of 13 under par and six-shot win over Rahm, Jason Day, Sepp Straka and Tom Kim.Rory McIlroy and Emiliano Grillo finished another stroke back, with home favourite Tommy Fleetwood and Royal Liverpool member Matthew Jordan in a tie for 10th.Harman, who is just the third left-hander to win the Open after Bob Charles (1963) and Phil Mickelson (2013), last tasted victory on the PGA Tour in 2017, the same year in which he led by one after 54 holes of the US Open before finishing second to Brooks Koepka.Padraig Harrington posted a final round 74 to finish in a tie for 64th on eight over.Only two players in championship history had squandered a five-shot lead after 54 holes – Macdonald Smith in the last Open staged at Prestwick in 1925 and Jean van de Velde at Carnoustie in 1999.Harman briefly looked in danger of joining that unhappy club when he dropped a shot on the second before Rahm closed the gap further with a fortunate birdie on the par-five fifth.Rahm's drive was pulled towards a collection of gorse bushes but somehow avoided all of them and left the world number three with a good lie and clear shot, from where he came up just short of the green and