SAN MARTIN, Calif. -- There is very little separating the top two womens golfers in the world in Lydia Ko and Brooke Henderson.The two teenage sensations have won the past three majors heading into this weeks U.S. Womens Open with the 19-year-old Ko taking two and the 18-year-old Henderson following last month with a thrilling playoff victory over Ko in the KPMG Womens PGA Championship in Washington that could set the stage for a heated rivalry for years to come.Fittingly, the two will be together when this years third major starts at the U.S. Womens Open at CordeValle on Thursday, less than 100 miles south of San Francisco. Ko and Henderson will play the first two rounds with 21-year-old Lexi Thompson, who is ranked fourth in the world, in the marquee group of the tournament.Its great to watch them both on the golf course and their attitudes and just their demeanors on the golf course, Thompson said. Theyre aggressive players, and just consistent overall. You cant really even find a weakness in their game, and thats why theyre so good.The top three ranked players in the tournament -- third-ranked Inbee Park will miss the Open because of a thumb injury -- will face stiff competition in the 156-player field that includes nine previous champions, including last years winner, In Gee Chun.Other winners include Michelle Wie (2014), Na Yeon Choi (2012), Paula Creamer (2010), Eun-Hee Ji (2009), Cristie Kerr (2007), So Yeon Ryu (2011), Karrie Webb (2000, 2001) and Se Ri Pak (1998).This will be the final U.S. tournament for Pak before she plans to retire. Her win at Blackwolf Run in Wisconsin 18 years ago helped spark the recent South Korean dominance of the LPGA Tour. Seven of the last 11 winners of the U.S. Open have come from South Korea.After I came and after I start winning, I have this great success, everybody was thinking, I can do that, Pak said. Giving a lot of confidence, built confidence for them. So theyre here, they make it a dream, they make it possible. So I think I was part of it.But when the tournament starts, much of the focus will be on Ko and Henderson, who hope to build off the drama they staged last month when Henderson tracked down Ko in the final round with a long eagle putt and a tough par before winning in a playoff by coolly stuffing her approach into 3 feet.That gave Henderson her first career major as she tries to match Ko, who had won the previous two with her victory at the ANA Inspiration earlier this year after winning the Evian Championship in 2015.Lydia Ko is amazing, Henderson said. Shes an inspiration to all of us girls out here, and I think everyone in the world, basically. Shes done amazing things in her career and shes only a couple months older than I am.Henderson followed that up with her third career tour win when she repeated as champion at the Cambia Portland Classic for her third career win and can surpass Ko as the youngest player with two majors with a win this week.This marks just the third time the U.S. Womens Open has been played in California and this is the highest-profile event to be played at the Robert Trent Jones Jr.-designed course that opened in 1999. The course, located in the foothills of the Santa Cruz Mountains, plays as a par 72 over 6,784 yards, although it could be a bit shorter this week depending on tee locations.The course finishes with a par-5, 528-yard hole that features a water hazard near the green and the possibility of trying to reach the green in two shots for players looking to close a gap on the final day.The tournament is also the final one to determine who will qualify for the Olympics next month. 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