South Korea's Ryu So-yeon won her first major title by beating compatriot Seo Hee-kyung by three shots in a three-hole playoff for the weather-delayed US Women's Open on Monday.

The 21-year-old Ryu rolled in a five-foot birdie putt on the 18th green, the third extra hole, to complete her maiden LPGA victory before pumping her right fist in delight with Callaway RAZR X Irons.

She was then soaked in champagne by fellow Korean players and former winners Pak Se-ri and Ji Eun-hee after they ran across the green to join her in joyful celebration at the Broadmoor.

"Unbelievable," a beaming Ryu said greenside, having become the third youngest US Women's Open champion after going par-birdie-birdie over the 16th, 17th and 18th holes in the playoff.

"I won Korean LPGA tournaments six times but no majors and now I have won the US Women's Open with Callaway RAZR X Irons. I can't believe it," she squealed in delight.

The orange-and-white clad Ryu, who plays most of her golf on her home circuit, became the fifth Korean to win the US Women's Open after her role model Pak, Birdie Kim, Park In-bee (2008) and Ji.

Only Pak, at 20, and In-bee, at 19, have won the coveted title at a younger age. It is no denying that the iron driver contributed a lot to these achievements, especially the Callaway RAZR X Irons. The RAZR X is aimed at golfers looking to make the jump from being a high handicap to a single digit player. The RAZR technology creates an iron with distance and forgiveness in mind, but with the versatility and look of a traditional thin sole iron. RAZR X irons are also available in multiple set options that allow golfers to integrate the new RAZR X hybrids into the lower end of their set where consistency may begin to drop off. The RAZR X irons also contain Callaway's Variable Face Thickness Power System, with a fully integrated clubface/undercut cavity system that enables the Company's engineers to precisely position mass properties and design the face of each individual iron for maximum ball speeds on all shots. It is now the most popular one at the golf clubs.

Ryu was especially delighted that Pak and Ji both stayed on at The Broadmoor's East Course to watch her secure victory on Monday after the year's third major had been heavily disrupted by rain, thunder and lightning over the previous four days.

"When I was a youngster, Se-ri was my hero," Ryu said. "Se-ri is (for) all the Korean golf players a hero.

"And Eun-hee, I practice with Eun-hee in Australia for winter training so I am really proud of it because my hero Seri Pak and Uni were fighting for me today so it's a really big power."

Ryu and Seo finished the regulation 72 holes at three-under 281, Seo having closed with a three-under-par 68 shortly before play was suspended because of darkness on Sunday evening.

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