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Brooke Henderson hits her stride. USATSI

If you were busy watching the FedEx St. Jude Classic, you missed an epic finish at the second LPGA major championship of the season. Lydia Ko was rolling towards her third straight women's major at the Women's PGA Championship at Sahalee Country Club when 18-year-old Canadian Brooke Henderson got in the way.

Henderson is not a nobody, mind you. She is now ranked No. 2 in the world behind Ko (albeit far behind Ko) and has five top 10s at majors in the last three years. She stared down Ko for her first major win with a final-round 65, including an insane birdie on the 71st hole and an even more insane par save on the final hole of regulation to get into a playoff.

Here's a look at the birdie.

On the first hole of the playoff, Henderson (who won a car with an ace earlier in the week and gave it to her sister and caddie, Brittany) cooly stuck one to about five feet for the easy birdie and win.

She made it look easy, but everyone else was losing their minds. And rightfully so. This was Nos. 1 and 2 in the world duking it out for a major. When does that ever happen? Throw in the fact that they're both teenagers, and this was Tiger Woods getting taken down by Sergio Garcia at the 1999 PGA Championship only if it had actually, you know, happened.

Ko, as usual, said it best.

"I'm happy with the way I played," said Ko. "I just got outplayed."