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At the end of a week in which Lydia Ko was written off by some extremely knowledgeable judges, she bounced back with an incredible shot to win her first title in two years.

The 21-year-old star capped a wire-to-wire win at the MEDIHEAL Championship by knocking a 3-wood 234 yards on the par-5 18th to within two-and-a-half feet and made the putt for an eagle 3 to down Minjee Lee in the playoff.

Her emotion was hard to hide after what has been a challenging period in her already wonderful career.

"I don't know if anybody could beat that", Lee said about Ko's second shot.

"It's insane because I was three over for the day at one stage today and I said, 'hey, you know, you've just got to focus and you never know what's going to happen, '" Ko said.

Ko took a one-shot lead in to Sunday but bogeyed three of her opening six holes to open the door for the chasing pack, only to roll in a 10-footer at the seventh and add another birdie at the 10th.

Lee regained a share of the lead with her hole out from a bunker at 17, where Ko left her birdie putt well right and settled for a par.

"It's disappointing that I couldn't do better on the back nine".

The Royal Fremantle member had gone 35 events without a victory and while Ko walked away with the win, Lee will leave San Francisco with her head high and safe in the knowledge her return to the winner's circle isn't far away, either.

Lydia Ko was all smiles - and a few tears - after breaking her drought.

"There's a lot of emotions".

It was Ko's third win at Lake Merced Golf Club after victories in the 2014 and "15 Swinging Skirts Classic, while Lee won the US Girls" Championship on the same course in 2012.

"I knew that my game was there, but I just kind of need to put the pieces together and I felt like I was able to do that this week. Probably the best round because of the situation, didn't make pretty much no mistakes today, so I'm super happy".

"Sometimes self pressure is the biggest thing".