EDITORIAL:

What's happened to Lydia Ko? For a long time the world's best female golfer, the 22-year-old has been in a slump over the past 18 months.

That decline appeared to reach its nadir last week at the British Open, one of the five majors for women players.

Ko shot rounds of 76 and 80, to miss the cut by 10 strokes, which represented her worst performance as a professional. A week earlier she was also out of contention early at another major, falling outside the cut line after struggling across two erratic days.

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Given Ko's achievements, which include 15

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