SAMMAMISH, Wash. — Just three holes into her round, Brooke Henderson could tell she needed a spark.
Her fourth career hole-in-one and a new car — to be donated to her caddie sister — did more than enough.
Buoyed by the early ace and birdies on her final two holes, Henderson took the first-round lead Thursday in the Women’s PGA Championship, the second of the LPGA Tour’s five major championships.
The 18-year-old Canadian, ranked fourth in the world, had a 4-under 67 on a cool day at Sahalee Country Club. Henderson aced the 13th hole — her fourth hole of the day — hitting a 7-iron from 155 yards to the left side of the green. The shot caught the apron and funneled directly to…