Ariya Jutanugarn, 15 of Thailand 

Advanced to the quarterfinals with a 1-up victory over Jisoo Keel … competing in her third U.S. Girls’ Junior (2009-2010) … also competed in the 2010-11 Women’s Open, 2010 Women’s Amateur and 2010 Women’s Amateur Public Links … was the stroke-play medalist at the 2010 Women’s Amateur Public Links, where she lost to 2010 Curtis Cup Team member Cydney Clanton in the third round … was the low amateur at the 2011 Kraft Nabisco Championship … won the 2011 Rolex Girls’ Junior Championship … became the youngest player to qualify for an LPGA Tour event at age 11, when she qualified for the 2007 Honda LPGA Thailand event …  a member of the 2010 AJGA Rolex Junior All-America First Team … daughter of Somboon and Narumon … has one sister, Moriya, who was the low amateur at the 2011 Women’s Open and is serving as Ariya’s caddie this week … also has one brother … lives in Bangkok, Thailand, but spends five months per year in the United States, playing golf … birthday is November 23, 1995

Gabriella Then, 15, of Rancho Cucamonga, Calif. 

Advanced to the quarterfinals with a 5-and-3 victory over Caroline Araskog … competing in her second U.S. Girls’ Junior (2010) … also competed in the 2010 Women’s Open, 2008 and 2010 Women’s Amateur and 2008 Women’s Amateur Public Links … winner of the 2011 Rolex Tournament of Champions in a playoff over Ariya Jutanugarn … a 2010 AJGA Rolex Junior All-America Team Honorable Mention … daughter of Andre and Maya … has one sister, Angella … birthday is October 22, 1995

Amy Lee, 14, of Brea, Calif. 

Advanced to the quarterfinals with a 1-up victory over Alison Lee … competing in her first USGA championship … finished second at the 2011 AJGA Junior at Centennial … daughter of Tae Hee and Soo Jung … birthday is February 1, 1997

Talia Campbell, 17, of Dallas, Texas 

Advanced to the quarterfinals with a 4-and-3 victory over Mariah Stackhouse … competing in her first USGA championship … tied for eighth at the 2011 Bubba Conlee … a member of the Ursuline Academy team that won the last three consecutive Texas Association of Private and Parochial Schools (TAPPS) 5A state championships … has also won two consecutive TAPPS individual state championships … is a second-degree black belt in Tae Kwon Do … daughter of John and Tanya … has one brother, JC … birthday is October 14, 1993

Karen Chung, 16, of Livingston, N.J. 

Advanced to the quarterfinals with a 1-up victory over Ashlan Ramsey … competing in her fourth U.S. Girls’ Junior (2008-2010) … was the runner-up to Alexis Thompson in 2008 … competed in the 2008 and 2010 Women’s Amateur and 2010 Women’s Amateur Public Links … won the 2011 Thunderbird International Junior … a member of the 2008 Rolex Junior All-American First Team and 2009-10 Second Team … daughter of Edward and Ivy … birthday is April 11, 1995

Yu Liu, 15, of the People’s Republic of China 

Advanced to the quarterfinals with a 1-up victory over Anne Cheng … competing in her first USGA championship … won the 2011 Under Armour/Vicky Hurst Championship … tied for second at the 2011 Rolex Girls Junior Championship … lives in Beijing … birthday is November 15, 1995

Summar Roachell, 16, of Conway, Ark. 

Advanced to the quarterfinals with a 5-and-3 victory over Aurora Kan … competing in her second U.S. Girls’ Junior (2010) … won the 2011 Bubba Conlee … tied for second at the 2011 Genesis Shootout presented by Valero Texas Open … a two-time Arkansas Class 7A and overall state high school champion … works with The First Tee of Arkansas’ “Golfing with the Girls” program … daughter of Bill and Lisa … birthday is November 22, 1994

Dottie Ardina, 17, of the Philippines 

Advanced to the quarterfinals with a 1-up victory over Yueer Cindy Feng … competing in her fourth U.S. Girls’ Junior (2007, 2009-10) … also competed in the U.S. Women’s Amateur (2008-09) … represented the Philippines at the 2006 and 2010 Women’s World Amateur Team Championships … won the 2011 Philippine Closed Match Play … the runner-up at the 2011 Philippines Ladies Open, Thailand Ladies Amateur Open and Philippine Amateur … daughter of Edgardo and Gina … birthday is December 2, 1993