The U.S. Women's Open tees off Thursday at Lancaster Country Club in Lancaster, Pa. Below are four featured groups to keep an eye on Thursday and Friday. Click here for full-field tee times (all times Eastern):
7:51 a.m. (No. 1) / 1:36 p.m. (No. 10) – Michelle Wie, Kristen Gillman (A), Mo Martin
The defending champion, Wie, gets the reigning U.S. Women's Amateur champion, Gillman, and the reigning Women's British champion, Martin. The last woman to successfully defend her U.S. Women's Open title? Karrie Webb in 2001. Wie, who's battled injury for the majority of the year, does not have a top-10 finish in 2015.
8:02 a.m. (No. 1) /1:47 p.m. (No. 10) – So Yeon Ryu, Stacy Lewis, Lydia Ko
Ryu is a former champion, winning in a playoff in 2011, while Lewis is in search of her first U.S. Women's Open and Ko her first major of any kind. Lewis nearly picked up her third major earlier this year at the ANA Inspiration and has five top-three finishes in 2015 without a victory. Ko lost her No. 1 ranking when she missed the cut at the Women's PGA, where Inbee Park claimed victory and the top spot.
1:36 p.m. (No. 10) / 7:51 a.m. (No. 1) – Na Yeon Choi, Cristie Kerr, Lexi Thompson
Two former champions, Choi (2011) and Kerr (2007), draw Thompson, who was paired with Wie on Moving Day last year at Pinehurst before stumbling to a 74-71 weekend. Choi was also runner-up in 2010, while Kerr has four other top-four finishes, most recently a solo third in 2011.
1:58 p.m. (No. 1) /8:13 a.m. (No. 10) – Inbee Park, Brittany Lincicome, Hyo-Joo Kim
The last three major winners are grouped together. Park most recently took home the Women's PGA, while Lincicome won the ANA and Kim nabbed the Evian Championship last year. Park won her first major title at the U.S. Women's Open in 2008 and then went four consectuive seasons without one. Of course, she's added five more major titles in the last three years.