Yamashita took control of the tournament on Friday morning with a seven-under-foot round of 65 and led by that moment.
He briefly shared the top position with a partner playing with a Lim Kim in his final round, but in the second the South Korean Birdi was done quickly after a continuous bogie.
The plow, which put himself into a dispute with six-under 66 on Saturday, quickly emerged as the main challenger for the world’s number 15 Yamashita.
Both of them played their first nine holes in three, which means that Yamashita reached the turn of three shots.
Hull refused to trust and continued to attack, closing a shot until an expensive journey for a fairway bunker on 16th until 16th.
A couple of groups back and forth, the Yamashita was making remarkable and capable of limiting the loss of her rare errors – equal to the spectacular savings with a long put in the 14th.
With the knowledge that a bogie would be sufficient to win on 18th, there were some nervous moments when Yamashita found Rough with her first two shots – a equilibrium before a safe chip on Green confirmed that she would be the third Japanese winner of women’s open.
Speaking through a translator in the trophy presentation, he said: “All these amazing fans have such an incredible feeling to win such a historic tournament.
Yamashita said, “It is very special to be a part of such a moment in history.”
