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She lowered a putt from two meters and made a birdie on the final 18th hole and kissed her fingertips and stretched her hands towards the sky.
Then she was sprayed with bubbling water by rushing colleagues and friends.
25-year-old Jin Young Ko has now been world number one for 73 weeks in a row.
Before today's round, she was challenged for the place as world number one by the South Korean teammate Sei Young Kim, who was in the lead.
If Sei Young Kim had won and Jin Young Ko had been worse than ten, there would have been a change of place at the top.
But it was never close.
Jin Young Ko showed who is the best and went around today's round in pleasant summer weather of 66 strokes (-5) after seven birdies and a bogey in addition to the par.
When Jin Young Ko put the ball near the flag on the 18th hole, she burst into a smile and felt that the matter was over. She won by five strokes.