Yamashita assumed management of the event with a seven-under-par spherical of 65 on Friday morning and led from that second on.
She briefly shared prime spot with enjoying associate A Lim Kim early in her last spherical, however the South Korean’s birdie on the second was rapidly adopted by consecutive bogeys.
Hull, who propelled herself into rivalry with a six-under 66 on Saturday, rapidly emerged as the principle challenger to world quantity 15 Yamashita.
They each performed their first 9 holes in three below par, which means Yamashita reached the flip three photographs clear.
Hull refused to relent and continued to assault, closing the hole to at least one shot till a expensive journey to a fairway bunker on the sixteenth.
A few teams additional again, Yamashita stayed remarkably composed and was capable of restrict the harm of her uncommon errors – beautifully saving par with a prolonged putt on the 14th.
With the data {that a} bogey on the par-five 18th could be sufficient for victory, there have been some nervous moments when Yamashita discovered the tough along with her first two photographs – earlier than a secure chip onto the inexperienced arrange a par that confirmed she could be the third Japanese winner of the Ladies’s Open.
Talking by way of a translator on the trophy presentation, she stated: “To win such a historic event in entrance of all these superb followers is such an unbelievable feeling.
“To be a part of such a second in historical past is one thing very particular,” added Yamashita – who collected a winner’s prize of $1.462m (£1.1m).
