Winning her first major title on home soil seemed too good to be true for England's Georgia Hall.
The Thai 28-year-old was two ahead after four birdies in the first six holes and still one ahead at the turn.
Dorset's Hall was a shot behind having turned in 32 but gained the advantage after draining a 25-foot putt up the hill for birdie on the 16th.
It was fitting that Wayne, a former two-handicapper himself, was on the bag to experience the biggest moment of his daughter's career. Hall would be the first Englishwomen to win the Open in 14 years. And the way Hall kept her composure and kept producing the shots of her life down the stretch, there might be more major titles to come.
New Zealand's Lydia Ko could not summon the fast finish she needed at golf's Women's British Open at Royal Lytham to finish in a tie for 11th, 11 shots behind surprise home victor Georgia Hall.
"It was great to get so much support, I haven't really had that before because I play in America quite a bit", Hall said.
The 22-year-old from Bournemouth is just the third home victor of the event since it became a major in 2001, following in the footsteps of Karen Stupples (2004) and Catriona Matthew (2009).More news: France to ban smartphones in schools
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Dame Laura Davies believes Georgia Hall can inspire future golfing champions after the 22-year-old claimed a maiden major title at the Ricoh Women's British Open.
The New Zealander had started the final day in a tie for ninth at seven-under - six shots off the lead.
Hall fired birdies on Nos.
She won by two shots from Pornanong (70). That regained a two-shot lead for Pornanong, who had also birdied the par-three fifth hole.
Lydia Ko lines up a putt during her final round of the Women's British Open at Royal Lytham & St. Annes.
An errant drive on the eighth led to a bogey for Phatlum, and Hall moved into a share of the lead thanks to a birdie from 10 feet on the 13th.
But Hall chose the ideal moment to showcase her best golf and took the lead at exactly the right moment, sinking a flawless 20-foot putt on the sixteenth after Phatlum had found the green-side bunker.